refactor(console): phase 1 — extract pure ConsoleTextLayout (wrap/hit-test/selection)

Lift the console's word-wrap layout, screen->text hit-testing, and selection extraction
out of ConsoleTab into a pure, ImGui-free module (console_text_layout.{h,cpp}). Text
measurement is injected via a ConsoleTextMeasure interface — production uses an
ImFont-backed impl (identical CalcWordWrapPositionA/CalcTextSizeA calls as before), while
tests drive a fixed-width stub.

- BuildConsoleLayout: per-line wrap segments + heights + cumulative Y (was inline in
  renderOutput).
- HitTestConsoleLayout: point -> (visibleRow, byte col) (was screenToTextPos).
- ExtractConsoleSelection: selected text across visible lines (was getSelectedText).
- ConsoleTab now holds a single `ConsoleLayout layout_` (replacing 4 mutable members;
  drops the dead cached_wrap_width_) and calls the pure functions.
- New unit test testConsoleTextLayout covers wrapping, multi-row hit-testing, bottom
  clamp, and filtered/unfiltered selection — the biggest previously-untested surface.

No behavior change (algorithm preserved verbatim). Full-node + lite build clean, ctest
green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CMakeLists.txt

@@ -460,6 +460,7 @@ set(APP_SOURCES
     src/ui/windows/console_input_model.cpp
     src/ui/windows/console_output_model.cpp
     src/ui/windows/console_tab_helpers.cpp
+    src/ui/windows/console_text_layout.cpp
     src/ui/windows/settings_window.cpp
     src/ui/pages/settings_page.cpp
     src/ui/windows/about_dialog.cpp
@@ -1019,6 +1020,7 @@ if(BUILD_TESTING)
         src/ui/windows/console_input_model.cpp
         src/ui/windows/console_output_model.cpp
         src/ui/windows/console_tab_helpers.cpp
+        src/ui/windows/console_text_layout.cpp
         src/ui/windows/mining_benchmark.cpp
         src/ui/windows/mining_pool_panel.cpp
         src/ui/windows/mining_tab_helpers.cpp

src/ui/windows/console_tab.cpp

@@ -534,6 +534,21 @@ std::string extractCopyableToken(const std::string& text, int col)
     std::string tok = text.substr(s, e - s + 1);
     return tok.size() >= 16 ? tok : std::string();  // txids/blockhashes/addresses are long
 }
+
+// Production ConsoleTextMeasure backed by the active ImGui font (used for word-wrap +
+// per-character positioning). The pure layout module is measured against this in prod and
+// a fixed-width stub in tests.
+struct ImFontConsoleMeasure : ConsoleTextMeasure {
+    ImFont* font;
+    float   fontSize;
+    ImFontConsoleMeasure(ImFont* f, float s) : font(f), fontSize(s) {}
+    float width(const char* begin, const char* end) const override {
+        return font->CalcTextSizeA(fontSize, FLT_MAX, 0.0f, begin, end).x;
+    }
+    const char* wrapPosition(const char* begin, const char* end, float wrapWidth) const override {
+        return font->CalcWordWrapPositionA(fontSize / font->LegacySize, begin, end, wrapWidth);
+    }
+};
 } // namespace
 
 void ConsoleTab::renderOutput()
@@ -543,8 +558,8 @@ void ConsoleTab::renderOutput()
     std::lock_guard<std::mutex> lock(lines_mutex_);
     
     // Zero item spacing so Dummy items advance the cursor by exactly their
-    // height.  The inter-line gap is added explicitly to wrapped_heights_
+    // height.  The inter-line gap is added explicitly to layout_.heights
-    // so that cumulative_y_offsets_ stays perfectly in sync with actual
+    // so that layout_.cumulativeY stays perfectly in sync with actual
     // cursor positions (avoiding selection-offset drift).
     float interLineGap = S.drawElement("tabs.console", "output").getFloat("line-spacing", 0.0f);
     ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0));
@@ -601,60 +616,11 @@ void ConsoleTab::renderOutput()
     ImFont* font = ImGui::GetFont();
     float fontSize = ImGui::GetFontSize();
     
-    wrapped_heights_.resize(visible_count);
+    ImFontConsoleMeasure measure(font, fontSize);
-    cumulative_y_offsets_.resize(visible_count);
+    layout_ = BuildConsoleLayout(
-    visible_wrap_segments_.resize(visible_count);
+        visible_count,
-    total_wrapped_height_ = 0.0f;
+        [this](int vi) -> const std::string& { return lines_[visible_indices_[vi]].text; },
-    cached_wrap_width_ = wrap_width;
+        wrap_width, line_height, interLineGap, measure);
-    
-    for (int vi = 0; vi < visible_count; vi++) {
-        int i = visible_indices_[vi];
-        const std::string& text = lines_[i].text;
-        auto& segs = visible_wrap_segments_[vi];
-        segs.clear();
-        
-        if (text.empty()) {
-            segs.push_back({0, 0, 0.0f, line_height});
-            cumulative_y_offsets_[vi] = total_wrapped_height_;
-            wrapped_heights_[vi] = line_height + interLineGap;
-            total_wrapped_height_ += wrapped_heights_[vi];
-            continue;
-        }
-        
-        // Walk the text using ImFont::CalcWordWrapPositionA to find
-        // exactly where ImGui would break each visual row.
-        const char* textStart = text.c_str();
-        const char* textEnd   = textStart + text.size();
-        const char* cur       = textStart;
-        float segY = 0.0f;
-        
-        while (cur < textEnd) {
-            const char* wrapPos = font->CalcWordWrapPositionA(
-                fontSize / font->LegacySize, cur, textEnd, wrap_width);
-            // Ensure forward progress (at least one character)
-            if (wrapPos <= cur) wrapPos = cur + 1;
-            // Skip a leading newline character that ends the previous segment
-            if (*cur == '\n') { cur++; continue; }
-            
-            int byteStart = static_cast<int>(cur - textStart);
-            int byteEnd   = static_cast<int>(wrapPos - textStart);
-            // Trim trailing newline from this segment
-            if (byteEnd > byteStart && text[byteEnd - 1] == '\n') byteEnd--;
-            
-            segs.push_back({byteStart, byteEnd, segY, line_height});
-            segY += line_height;
-            cur = wrapPos;
-        }
-        
-        if (segs.empty()) {
-            segs.push_back({0, 0, 0.0f, line_height});
-            segY = line_height;
-        }
-        
-        cumulative_y_offsets_[vi] = total_wrapped_height_;
-        wrapped_heights_[vi] = segY + interLineGap;
-        total_wrapped_height_ += wrapped_heights_[vi];
-    }
     
     // Use raw IO for mouse handling to bypass child window event consumption
     ImGuiIO& io = ImGui::GetIO();
@@ -740,11 +706,11 @@ void ConsoleTab::renderOutput()
     
     // Find first visible line using binary search
     int first_visible = 0;
-    if (!cumulative_y_offsets_.empty()) {
+    if (!layout_.cumulativeY.empty()) {
-        int lo = 0, hi = static_cast<int>(cumulative_y_offsets_.size()) - 1;
+        int lo = 0, hi = static_cast<int>(layout_.cumulativeY.size()) - 1;
         while (lo < hi) {
             int mid = (lo + hi) / 2;
-            float line_bottom = cumulative_y_offsets_[mid] + wrapped_heights_[mid];
+            float line_bottom = layout_.cumulativeY[mid] + layout_.heights[mid];
             if (line_bottom < visible_top) {
                 lo = mid + 1;
             } else {
@@ -755,8 +721,8 @@ void ConsoleTab::renderOutput()
     }
     
     // Add invisible spacer for lines before first visible (for correct scroll)
-    if (first_visible > 0 && first_visible < static_cast<int>(cumulative_y_offsets_.size())) {
+    if (first_visible > 0 && first_visible < static_cast<int>(layout_.cumulativeY.size())) {
-        ImGui::Dummy(ImVec2(0, cumulative_y_offsets_[first_visible]));
+        ImGui::Dummy(ImVec2(0, layout_.cumulativeY[first_visible]));
     }
     
     ImDrawList* dl = ImGui::GetWindowDrawList();
@@ -765,17 +731,17 @@ void ConsoleTab::renderOutput()
     // Render visible lines
     int last_rendered_vi = first_visible - 1;
     for (int vi = first_visible; vi < visible_count; vi++) {
-        if (vi < static_cast<int>(cumulative_y_offsets_.size()) &&
+        if (vi < static_cast<int>(layout_.cumulativeY.size()) &&
-            cumulative_y_offsets_[vi] > visible_bottom) {
+            layout_.cumulativeY[vi] > visible_bottom) {
             break;
         }
         last_rendered_vi = vi;
         
         int i = visible_indices_[vi];
         const auto& line = lines_[i];
-        const auto& segs = visible_wrap_segments_[vi];
+        const auto& segs = layout_.segments[vi];
         ImVec2 lineOrigin = ImGui::GetCursorScreenPos();
-        float totalH = wrapped_heights_[vi];
+        float totalH = layout_.heights[vi];
 
         // Left-edge channel accent bar, drawn in the padX margin so it never overlaps
         // the text or the selection highlight.
@@ -831,7 +797,7 @@ void ConsoleTab::renderOutput()
             const char* segEnd   = line.text.c_str() + seg.byteEnd;
 
             if (s_scanline_enabled && line_height > 0.0f) {
-                int rowIndex = static_cast<int>(std::floor((cumulative_y_offsets_[vi] + seg.yOffset) / line_height + 0.5f));
+                int rowIndex = static_cast<int>(std::floor((layout_.cumulativeY[vi] + seg.yOffset) / line_height + 0.5f));
                 scanline_rows_.push_back({rowY, rowY + seg.height, rowIndex});
             }
             
@@ -890,10 +856,10 @@ void ConsoleTab::renderOutput()
     
     // Add spacer for lines after last visible (to maintain correct content height)
     if (last_rendered_vi >= 0 && last_rendered_vi < visible_count - 1) {
-        float rendered_height = (last_rendered_vi < static_cast<int>(cumulative_y_offsets_.size()))
+        float rendered_height = (last_rendered_vi < static_cast<int>(layout_.cumulativeY.size()))
-            ? cumulative_y_offsets_[last_rendered_vi] + wrapped_heights_[last_rendered_vi]
+            ? layout_.cumulativeY[last_rendered_vi] + layout_.heights[last_rendered_vi]
             : 0.0f;
-        float remaining_height = total_wrapped_height_ - rendered_height;
+        float remaining_height = layout_.totalHeight - rendered_height;
         if (remaining_height > 0) {
             ImGui::Dummy(ImVec2(0, remaining_height));
         }
@@ -1017,80 +983,17 @@ void ConsoleTab::renderOutput()
 
 ConsoleTab::TextPos ConsoleTab::screenToTextPos(ImVec2 screen_pos) const
 {
-    TextPos pos;
+    if (visible_indices_.empty()) return {0, 0};
-    
-    if (visible_indices_.empty()) {
-        return {0, 0};
-    }
-    
-    float relative_y = screen_pos.y - output_origin_.y;
-    
-    // Binary search for the visible line that contains this Y position
-    int visible_line = 0;
-    if (!cumulative_y_offsets_.empty()) {
-        int lo = 0, hi = static_cast<int>(cumulative_y_offsets_.size()) - 1;
-        while (lo < hi) {
-            int mid = (lo + hi + 1) / 2;
-            if (cumulative_y_offsets_[mid] <= relative_y) {
-                lo = mid;
-            } else {
-                hi = mid - 1;
-            }
-        }
-        visible_line = lo;
-    }
-    
-    // Clamp visible line
-    if (visible_line < 0) visible_line = 0;
-    if (visible_line >= static_cast<int>(visible_indices_.size())) {
-        visible_line = static_cast<int>(visible_indices_.size()) - 1;
-        pos.line = visible_indices_[visible_line];
-        pos.col = static_cast<int>(lines_[pos.line].text.size());
-        return pos;
-    }
-    
-    pos.line = visible_indices_[visible_line];
-    const std::string& text = lines_[pos.line].text;
-    
-    if (text.empty()) {
-        pos.col = 0;
-        return pos;
-    }
-    
-    // Find which sub-row (wrap segment) the mouse Y falls into
-    const auto& segs = visible_wrap_segments_[visible_line];
-    float lineRelY = relative_y - cumulative_y_offsets_[visible_line];
-    int segIdx = 0;
-    for (int s = 0; s < static_cast<int>(segs.size()); s++) {
-        if (lineRelY >= segs[s].yOffset)
-            segIdx = s;
-    }
-    const auto& seg = segs[segIdx];
-    
-    // Calculate column within this segment from X position
-    float relative_x = screen_pos.x - output_origin_.x;
-    if (relative_x <= 0.0f) {
-        pos.col = seg.byteStart;
-        return pos;
-    }
-    
-    ImFont* font = ImGui::GetFont();
-    float fontSize = ImGui::GetFontSize();
-    const char* segStart = text.c_str() + seg.byteStart;
-    int segLen = seg.byteEnd - seg.byteStart;
 
-    // Walk characters within this segment for accurate positioning
+    ImFontConsoleMeasure measure(ImGui::GetFont(), ImGui::GetFontSize());
-    pos.col = seg.byteEnd; // default: past end of segment
+    ConsoleHit hit = HitTestConsoleLayout(
-    for (int c = 0; c < segLen; c++) {
+        layout_, static_cast<int>(visible_indices_.size()),
-        float wCur = font->CalcTextSizeA(fontSize, FLT_MAX, 0, segStart, segStart + c + 1).x;
+        [this](int vi) -> const std::string& { return lines_[visible_indices_[vi]].text; },
-        float wPrev = (c > 0) ? font->CalcTextSizeA(fontSize, FLT_MAX, 0, segStart, segStart + c).x : 0.0f;
+        screen_pos.x - output_origin_.x, screen_pos.y - output_origin_.y, measure);
-        float charMid = (wPrev + wCur) * 0.5f;
+
-        if (relative_x < charMid) {
+    TextPos pos;
-            pos.col = seg.byteStart + c;
+    pos.line = visible_indices_[hit.visibleRow];
-            return pos;
+    pos.col = hit.col;
-        }
-    }
-    
     return pos;
 }
 
@@ -1114,46 +1017,13 @@ ConsoleTab::TextPos ConsoleTab::selectionEnd() const
 std::string ConsoleTab::getSelectedText() const
 {
     if (!has_selection_) return "";
-    
     TextPos start = selectionStart();
     TextPos end = selectionEnd();
-    
+    return ExtractConsoleSelection(
-    if (start.line < 0 || start.line >= static_cast<int>(lines_.size())) return "";
+        static_cast<int>(lines_.size()),
-    
+        [this](int i) -> const std::string& { return lines_[i].text; },
-    // Build a set of visible line indices for quick lookup
+        visible_indices_,
-    // (Only copy visible lines when filtering is active)
+        {start.line, start.col}, {end.line, end.col});
-    std::unordered_set<int> visible_set(visible_indices_.begin(), visible_indices_.end());
-    bool has_filter = !visible_indices_.empty() && visible_indices_.size() < lines_.size();
-    
-    std::string result;
-    bool first_line = true;
-    
-    for (int i = start.line; i <= end.line && i < static_cast<int>(lines_.size()); i++) {
-        // Skip lines that aren't visible when filtering
-        if (has_filter && visible_set.find(i) == visible_set.end()) {
-            continue;
-        }
-        
-        const std::string& text = lines_[i].text;
-        
-        int col_start = 0;
-        int col_end = static_cast<int>(text.size());
-        
-        if (i == start.line) col_start = std::min(start.col, static_cast<int>(text.size()));
-        if (i == end.line) col_end = std::min(end.col, static_cast<int>(text.size()));
-        
-        // Add newline between lines (but not before first)
-        if (!first_line) {
-            result += "\n";
-        }
-        first_line = false;
-        
-        if (col_start < col_end) {
-            result += text.substr(col_start, col_end - col_start);
-        }
-    }
-    
-    return result;
 }
 
 void ConsoleTab::clearSelection()

src/ui/windows/console_tab.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include "console_text_layout.h"
 #include "../layout.h"
 #include "../../daemon/embedded_daemon.h"
 #include "../../daemon/xmrig_manager.h"
@@ -147,24 +148,12 @@ private:
     mutable int filter_match_count_ = 0;        // lines matching the text filter (for the toolbar)
     std::string context_token_;                 // hash/address under the cursor at right-click
     mutable std::vector<int> visible_indices_;  // Cached for selection mapping
-    
+
-    // Wrapped line height caching (for variable-height text wrapping)
+    // Wrap layout for the visible lines (segments + per-line heights + cumulative Y),
-    mutable std::vector<float> wrapped_heights_;      // Height of each visible line (accounts for wrapping)
+    // recomputed each frame by the pure BuildConsoleLayout (console_text_layout.h) and
-    mutable std::vector<float> cumulative_y_offsets_; // Cumulative Y offset for each visible line
+    // consumed by the renderer + hit-testing.
-    mutable float total_wrapped_height_ = 0.0f;       // Total height of all visible lines
+    mutable ConsoleLayout layout_;
-    mutable float cached_wrap_width_ = 0.0f;          // Wrap width used for cached heights
+
-    
-    // Sub-row layout: each visible line is split into wrap segments so
-    // selection and hit-testing know the exact screen position of every
-    // character.
-    struct WrapSegment {
-        int   byteStart;   // byte offset into ConsoleLine::text
-        int   byteEnd;     // byte offset past last char in this segment
-        float yOffset;     // Y offset of this segment relative to the line's top
-        float height;      // visual height of this segment
-    };
-    mutable std::vector<std::vector<WrapSegment>> visible_wrap_segments_; // [vi] -> segments
-    
     // Commands popup
     bool show_commands_popup_ = false;
 };

src/ui/windows/console_text_layout.cpp

@@ -0,0 +1,162 @@
+// DragonX Wallet - ImGui Edition
+// Copyright 2024-2026 The Hush Developers
+// Released under the GPLv3
+//
+// Pure implementation of the console wrap layout / hit-test / selection. No ImGui — the
+// algorithm mirrors the former inline code in ConsoleTab exactly, with text measurement
+// injected via ConsoleTextMeasure.
+
+#include "console_text_layout.h"
+
+#include <algorithm>
+
+namespace dragonx {
+namespace ui {
+
+ConsoleLayout BuildConsoleLayout(int visibleCount, const ConsoleLineAccessor& getVisibleText,
+                                 float wrapWidth, float lineHeight, float interLineGap,
+                                 const ConsoleTextMeasure& measure)
+{
+    ConsoleLayout L;
+    if (visibleCount < 0) visibleCount = 0;
+    L.segments.resize(visibleCount);
+    L.heights.resize(visibleCount);
+    L.cumulativeY.resize(visibleCount);
+    L.totalHeight = 0.0f;
+
+    for (int vi = 0; vi < visibleCount; vi++) {
+        const std::string& text = getVisibleText(vi);
+        auto& segs = L.segments[vi];
+        segs.clear();
+
+        if (text.empty()) {
+            segs.push_back({0, 0, 0.0f, lineHeight});
+            L.cumulativeY[vi] = L.totalHeight;
+            L.heights[vi] = lineHeight + interLineGap;
+            L.totalHeight += L.heights[vi];
+            continue;
+        }
+
+        const char* textStart = text.c_str();
+        const char* textEnd   = textStart + text.size();
+        const char* cur       = textStart;
+        float segY = 0.0f;
+
+        while (cur < textEnd) {
+            const char* wrapPos = measure.wrapPosition(cur, textEnd, wrapWidth);
+            if (wrapPos <= cur) wrapPos = cur + 1;         // ensure forward progress
+            if (*cur == '\n') { cur++; continue; }         // skip a newline ending the prior seg
+
+            int byteStart = static_cast<int>(cur - textStart);
+            int byteEnd   = static_cast<int>(wrapPos - textStart);
+            if (byteEnd > byteStart && text[byteEnd - 1] == '\n') byteEnd--;  // trim trailing '\n'
+
+            segs.push_back({byteStart, byteEnd, segY, lineHeight});
+            segY += lineHeight;
+            cur = wrapPos;
+        }
+
+        if (segs.empty()) {
+            segs.push_back({0, 0, 0.0f, lineHeight});
+            segY = lineHeight;
+        }
+
+        L.cumulativeY[vi] = L.totalHeight;
+        L.heights[vi] = segY + interLineGap;
+        L.totalHeight += L.heights[vi];
+    }
+
+    return L;
+}
+
+ConsoleHit HitTestConsoleLayout(const ConsoleLayout& layout, int visibleCount,
+                                const ConsoleLineAccessor& getVisibleText,
+                                float relX, float relY,
+                                const ConsoleTextMeasure& measure)
+{
+    ConsoleHit hit{0, 0};
+    if (visibleCount <= 0 || layout.cumulativeY.empty()) return hit;
+
+    // Binary search for the visible line containing relY.
+    int visibleLine = 0;
+    {
+        int lo = 0, hi = static_cast<int>(layout.cumulativeY.size()) - 1;
+        while (lo < hi) {
+            int mid = (lo + hi + 1) / 2;
+            if (layout.cumulativeY[mid] <= relY) lo = mid;
+            else hi = mid - 1;
+        }
+        visibleLine = lo;
+    }
+
+    if (visibleLine < 0) visibleLine = 0;
+    if (visibleLine >= visibleCount) {
+        visibleLine = visibleCount - 1;
+        hit.visibleRow = visibleLine;
+        hit.col = static_cast<int>(getVisibleText(visibleLine).size());
+        return hit;
+    }
+
+    hit.visibleRow = visibleLine;
+    const std::string& text = getVisibleText(visibleLine);
+    if (text.empty()) { hit.col = 0; return hit; }
+
+    // Which wrap sub-row does relY fall into.
+    const auto& segs = layout.segments[visibleLine];
+    float lineRelY = relY - layout.cumulativeY[visibleLine];
+    int segIdx = 0;
+    for (int s = 0; s < static_cast<int>(segs.size()); s++)
+        if (lineRelY >= segs[s].yOffset) segIdx = s;
+    const auto& seg = segs[segIdx];
+
+    if (relX <= 0.0f) { hit.col = seg.byteStart; return hit; }
+
+    const char* segStart = text.c_str() + seg.byteStart;
+    int segLen = seg.byteEnd - seg.byteStart;
+    hit.col = seg.byteEnd;  // default: past the end of the segment
+    for (int c = 0; c < segLen; c++) {
+        float wCur  = measure.width(segStart, segStart + c + 1);
+        float wPrev = (c > 0) ? measure.width(segStart, segStart + c) : 0.0f;
+        float charMid = (wPrev + wCur) * 0.5f;
+        if (relX < charMid) { hit.col = seg.byteStart + c; return hit; }
+    }
+    return hit;
+}
+
+std::string ExtractConsoleSelection(int lineCount, const ConsoleLineAccessor& getLine,
+                                    const std::vector<int>& visibleIndices,
+                                    ConsoleTextPos start, ConsoleTextPos end)
+{
+    if (start.line < 0 || start.line >= lineCount) return "";
+
+    // Only restrict to visible lines when a filter is active (fewer visible than total).
+    const bool hasFilter = !visibleIndices.empty() &&
+                           static_cast<int>(visibleIndices.size()) < lineCount;
+    std::vector<bool> visible;
+    if (hasFilter) {
+        visible.assign(lineCount, false);
+        for (int idx : visibleIndices)
+            if (idx >= 0 && idx < lineCount) visible[idx] = true;
+    }
+
+    std::string result;
+    bool firstLine = true;
+    for (int i = start.line; i <= end.line && i < lineCount; i++) {
+        if (hasFilter && !visible[i]) continue;
+
+        const std::string& text = getLine(i);
+        int colStart = 0;
+        int colEnd = static_cast<int>(text.size());
+        if (i == start.line) colStart = std::min(start.col, static_cast<int>(text.size()));
+        if (i == end.line)   colEnd   = std::min(end.col,   static_cast<int>(text.size()));
+
+        if (!firstLine) result += "\n";
+        firstLine = false;
+
+        if (colStart < colEnd) result += text.substr(colStart, colEnd - colStart);
+    }
+    return result;
+}
+
+} // namespace ui
+} // namespace dragonx

src/ui/windows/console_text_layout.h

@@ -0,0 +1,72 @@
+// DragonX Wallet - ImGui Edition
+// Copyright 2024-2026 The Hush Developers
+// Released under the GPLv3
+//
+// ConsoleTextLayout — pure (ImGui-free) word-wrap layout + hit-testing + selection
+// extraction for the console output. Text measurement is injected via ConsoleTextMeasure
+// so the production path uses ImFont exactly as before while tests drive it with a
+// fixed-width stub. Extracted from ConsoleTab::renderOutput / screenToTextPos /
+// getSelectedText so the trickiest console logic (byte-offset selection across wrapped
+// rows) becomes unit-testable.
+
+#pragma once
+
+#include <functional>
+#include <string>
+#include <vector>
+
+namespace dragonx {
+namespace ui {
+
+// One visual sub-row of a (possibly wrapped) logical line.
+struct ConsoleWrapSegment {
+    int   byteStart = 0;  // byte offset into the line's text
+    int   byteEnd   = 0;  // byte offset past the last char on this sub-row
+    float yOffset   = 0;  // Y offset of this sub-row relative to the line's top
+    float height    = 0;  // visual height of this sub-row
+};
+
+// The wrap layout for a set of visible lines.
+struct ConsoleLayout {
+    std::vector<std::vector<ConsoleWrapSegment>> segments;  // per visible line
+    std::vector<float> heights;       // per visible line (includes the inter-line gap)
+    std::vector<float> cumulativeY;   // cumulative Y offset of each visible line
+    float totalHeight = 0.0f;
+};
+
+struct ConsoleTextPos { int line = -1; int col = 0; };  // line = raw index; col = byte offset
+struct ConsoleHit     { int visibleRow = 0; int col = 0; };  // visibleRow = index into the visible set
+
+// Text measurement backend. Production wraps ImFont; tests inject a fixed-width stub.
+struct ConsoleTextMeasure {
+    virtual ~ConsoleTextMeasure() = default;
+    // Pixel width of the byte range [begin, end).
+    virtual float width(const char* begin, const char* end) const = 0;
+    // The byte position at which [begin, end) should wrap for the given width — mirrors
+    // ImFont::CalcWordWrapPositionA. Returns `end` when the whole range fits.
+    virtual const char* wrapPosition(const char* begin, const char* end, float wrapWidth) const = 0;
+};
+
+// Accessor returning a visible/raw line's text by index (avoids copying the buffer).
+using ConsoleLineAccessor = std::function<const std::string&(int)>;
+
+// Build the wrap layout for `visibleCount` lines (text via getVisibleText(0..N-1)).
+ConsoleLayout BuildConsoleLayout(int visibleCount, const ConsoleLineAccessor& getVisibleText,
+                                 float wrapWidth, float lineHeight, float interLineGap,
+                                 const ConsoleTextMeasure& measure);
+
+// Map a point relative to the layout origin to a (visibleRow, byte col). The caller maps
+// visibleRow -> a raw line index. Returns {0,0} when there are no visible lines.
+ConsoleHit HitTestConsoleLayout(const ConsoleLayout& layout, int visibleCount,
+                                const ConsoleLineAccessor& getVisibleText,
+                                float relX, float relY,
+                                const ConsoleTextMeasure& measure);
+
+// Extract the selected text between raw positions [start, end], restricted to visible
+// lines when a filter is active, joining lines with '\n'. Pure.
+std::string ExtractConsoleSelection(int lineCount, const ConsoleLineAccessor& getLine,
+                                    const std::vector<int>& visibleIndices,
+                                    ConsoleTextPos start, ConsoleTextPos end);
+
+} // namespace ui
+} // namespace dragonx

tests/test_phase4.cpp

@@ -15,6 +15,7 @@
 #include "ui/windows/console_input_model.h"
 #include "ui/windows/console_output_model.h"
 #include "ui/windows/console_tab_helpers.h"
+#include "ui/windows/console_text_layout.h"
 #include "ui/windows/mining_benchmark.h"
 #include "ui/windows/mining_pool_panel.h"
 #include "ui/windows/mining_tab_helpers.h"
@@ -2282,6 +2283,59 @@ void testDaemonLifecycleAdapters()
     fs::remove_all(dataDir);
 }
 
+// Pure console wrap layout / hit-test / selection (console_text_layout.h), driven by a
+// fixed-width measurement stub so the byte-offset selection math is unit-testable.
+void testConsoleTextLayout()
+{
+    using namespace dragonx::ui;
+    struct StubMeasure : ConsoleTextMeasure {
+        float charW = 10.0f;
+        float width(const char* b, const char* e) const override {
+            return static_cast<float>(e - b) * charW;
+        }
+        const char* wrapPosition(const char* b, const char* e, float w) const override {
+            int maxChars = static_cast<int>(w / charW);
+            if (maxChars < 1) maxChars = 1;
+            return (e - b) <= maxChars ? e : b + maxChars;
+        }
+    } stub;
+
+    std::vector<std::string> lines = { "", "abc", "abcdefghij" };  // 0, 3, 10 chars
+    auto get = [&lines](int i) -> const std::string& { return lines[i]; };
+    const float lineH = 12.0f, gap = 2.0f;
+
+    // wrapWidth 50 (charW 10 -> 5 chars/row)
+    ConsoleLayout L = BuildConsoleLayout(static_cast<int>(lines.size()), get, 50.0f, lineH, gap, stub);
+    EXPECT_EQ(L.segments.size(), static_cast<size_t>(3));
+    EXPECT_EQ(L.segments[0].size(), static_cast<size_t>(1));     // empty -> one empty seg
+    EXPECT_EQ(L.segments[0][0].byteEnd, 0);
+    EXPECT_NEAR(L.heights[0], lineH + gap, 0.01);
+    EXPECT_EQ(L.segments[1].size(), static_cast<size_t>(1));     // "abc" fits
+    EXPECT_EQ(L.segments[1][0].byteEnd, 3);
+    EXPECT_EQ(L.segments[2].size(), static_cast<size_t>(2));     // 10 chars, 5/row -> 2 rows
+    EXPECT_EQ(L.segments[2][0].byteEnd, 5);
+    EXPECT_EQ(L.segments[2][1].byteStart, 5);
+    EXPECT_EQ(L.segments[2][1].byteEnd, 10);
+    EXPECT_NEAR(L.heights[2], 2 * lineH + gap, 0.01);
+    EXPECT_NEAR(L.cumulativeY[2], 2 * (lineH + gap), 0.01);
+    EXPECT_NEAR(L.totalHeight, 3 * (lineH + gap) + lineH, 0.01);
+
+    // Hit-test: second wrap row of line 2, column 7.
+    ConsoleHit hit = HitTestConsoleLayout(L, 3, get, /*relX*/ 20.0f, /*relY*/ 45.0f, stub);
+    EXPECT_EQ(hit.visibleRow, 2);
+    EXPECT_EQ(hit.col, 7);
+    // Past the bottom clamps to the last line's end.
+    ConsoleHit last = HitTestConsoleLayout(L, 3, get, 1000.0f, 9999.0f, stub);
+    EXPECT_EQ(last.visibleRow, 2);
+    EXPECT_EQ(last.col, 10);
+
+    // Selection extraction (multi-line, no filter, then filtered to line 0 only).
+    std::vector<std::string> lines2 = { "hello", "world" };
+    auto get2 = [&lines2](int i) -> const std::string& { return lines2[i]; };
+    EXPECT_EQ(ExtractConsoleSelection(2, get2, {}, {0, 1}, {1, 3}), std::string("ello\nwor"));
+    EXPECT_EQ(ExtractConsoleSelection(2, get2, std::vector<int>{0}, {0, 1}, {1, 3}), std::string("ello"));
+}
+
 void testRendererHelpers()
 {
     EXPECT_NEAR(dragonx::ui::ComputeConsoleInputHeight(20.0f, 4.0f, 8.0f, 2.0f, 1.0f),
@@ -4959,6 +5013,7 @@ int main()
     testDaemonShutdownPolicy();
     testDaemonLifecycleExecution();
     testDaemonLifecycleAdapters();
+    testConsoleTextLayout();
     testRendererHelpers();
     testConsoleInputModel();
     testMiningBenchmarkModel();