fix(ui): stop spurious "Blockchain rescan complete" toast after restoring from minimize

While minimized the main loop skips the frame body (SDL_Delay+continue), so App::update() —
which drains the daemon output via outputSince(daemon_output_offset_) — never runs and the
offset isn't advanced. On restore the whole accumulated backlog is parsed in one batch: a
background witness rebuild's progress lines (parsed as a rescan → state_.sync.rescanning=true)
AND its "rebuilt … in Xms" completion (parsed as finished) arrive together and fire
"Blockchain rescan complete" for a scan the user never initiated.

On WINDOW_RESTORED, discard the daemon-output backlog (advance the offset to the current end,
via App::skipDaemonOutputBacklog) before the resumed update parses it — so only new output is
parsed. Genuine user-initiated rescans still surface completion via the getrescaninfo monitor.

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

src/app.cpp

@@ -5047,6 +5047,18 @@ void App::refreshNow()
     invalidateShieldedHistoryScanProgress(true);
 }
 
+void App::skipDaemonOutputBacklog()
+{
+    // While minimized, App::update() is paused, so daemon_output_offset_ is never advanced and a large
+    // backlog of daemon output piles up. Parsing it all at once on restore would replay a background
+    // witness rebuild's progress + completion in a single batch and fire a spurious "Blockchain rescan
+    // complete" toast. Advance the offset to the current end so only NEW (post-restore) output is parsed.
+    // A genuine user-initiated rescan still surfaces completion via the getrescaninfo monitor.
+    if (daemon_controller_ && daemon_controller_->isRunning()) {
+        (void)daemon_controller_->outputSince(daemon_output_offset_);  // advances daemon_output_offset_ to the end
+    }
+}
+
 void App::handlePaymentURI(const std::string& uri)
 {
     auto payment = util::parsePaymentURI(uri);

src/app.h

@@ -393,6 +393,10 @@ public:
 
     // Force refresh
     void refreshNow();
+    // Called on window restore: drop the daemon-output backlog that accumulated while minimized (the
+    // per-frame update loop was paused), so a background witness rebuild that started+finished during
+    // the minimize isn't parsed in one batch and mistaken for a completed rescan (spurious toast).
+    void skipDaemonOutputBacklog();
     void refreshMiningInfo();
     void refreshPeerInfo();
     void refreshMarketData();

src/main.cpp

@@ -1263,6 +1263,36 @@ int main(int argc, char* argv[])
             SDL_SetWindowMinimumSize(window, (int)(1024 * currentDpiScale), (int)(720 * currentDpiScale));
         }
 
+        // DEV/TEST hook (dormant unless the env is set): DRAGONX_WIN_GEOM="WxH" forces an exact window
+        // size, placing it on the largest display that can hold it and bypassing the primary-monitor
+        // clamp. Lets a headless WSLg sweep render at sizes wider than the 1280 primary (e.g. 2560x1440
+        // on the mirrored 4K/1440p outputs). Needs the x11 backend so absolute positioning takes effect.
+        int wantW = 0, wantH = 0;
+        if (const char* geom = std::getenv("DRAGONX_WIN_GEOM"))
+            sscanf(geom, "%dx%d", &wantW, &wantH);
+        if (wantW > 0 && wantH > 0) {
+            int count = 0;
+            SDL_DisplayID* disp = SDL_GetDisplays(&count);
+            SDL_DisplayID best = 0; SDL_Rect bestUsable{0, 0, 0, 0};
+            for (int i = 0; i < count; ++i) {
+                SDL_Rect u;
+                if (!SDL_GetDisplayUsableBounds(disp[i], &u)) continue;
+                bool fits = (u.w >= wantW && u.h >= wantH);
+                bool bestFits = (bestUsable.w >= wantW && bestUsable.h >= wantH);
+                // Prefer a display that fits; among those, the smallest; else the largest available.
+                if ((fits && !bestFits) ||
+                    (fits && bestFits && (long)u.w * u.h < (long)bestUsable.w * bestUsable.h) ||
+                    (!fits && !bestFits && (long)u.w * u.h > (long)bestUsable.w * bestUsable.h)) {
+                    bestUsable = u; best = disp[i];
+                }
+            }
+            if (disp) SDL_free(disp);
+            if (best) {
+                SDL_SetWindowMinimumSize(window, 320, 240);
+                SDL_SetWindowPosition(window, bestUsable.x + 10, bestUsable.y + 10);
+                SDL_SetWindowSize(window, wantW, wantH);
+            }
+        } else {
         // Clamp to the current display's work area — runs on EVERY startup (this clamp used to live
         // inside the HiDPI branch, so a size saved on a larger/disconnected monitor could open the
         // window off-screen or bigger than the screen on a same-DPI cold start).
@@ -1282,6 +1312,7 @@ int main(int argc, char* argv[])
                    curW, curH, newW, newH, currentDpiScale);
         }
         }
+    }
 #endif
     winlog("STARTUP  savedSize=%dx%d  currentDpiScale=%.3f", savedWinW, savedWinH, currentDpiScale);
     winlogState(window, "  startup");
@@ -1552,6 +1583,7 @@ int main(int argc, char* argv[])
                 // Window restored from minimized — trigger immediate data refresh
                 if (waitEvent.type == SDL_EVENT_WINDOW_RESTORED &&
                     waitEvent.window.windowID == SDL_GetWindowID(window)) {
+                    app.skipDaemonOutputBacklog();   // drop the minimized-period backlog (avoids a spurious "rescan complete" toast)
                     app.refreshNow();
                 }
                 // Handle DPI change that arrived while idle (same logic as poll loop)
@@ -1681,6 +1713,7 @@ int main(int argc, char* argv[])
             // Window restored from minimized — trigger immediate data refresh
             if (event.type == SDL_EVENT_WINDOW_RESTORED &&
                 event.window.windowID == SDL_GetWindowID(window)) {
+                app.skipDaemonOutputBacklog();   // drop the minimized-period backlog (avoids a spurious "rescan complete" toast)
                 app.refreshNow();
             }
             // Handle DPI/display scale changes (e.g. window dragged to a