fix(ui): cut ellipsis truncation on UTF-8 code-point boundaries

TruncateToWidth, the middle "front...back" ellipsis for addresses, pool
URLs, paths, labels and the status bar, cut at byte offsets: a
multi-byte character at either cut was split into invalid UTF-8 and
drawn as replacement characters (e.g. a translated Cyrillic or CJK
status). It also tried front lengths from n/2 down until one fit,
building and measuring a new string for each: up to O(n^2) per
truncated label per frame.

util::textfit::middleEllipsis keeps the same contract and is
byte-identical for ASCII, but snaps the front cut down and the back cut
up to code-point boundaries, and finds the largest fitting front length
by bisection into one reused buffer: O(log n) measures for single-line
text. Text containing a newline keeps the linear scan, because its
measured width (the widest line) does not grow steadily with the cut.

text_fit.h also gains largestFittingPrefix, a bisection over code-point
boundaries; its first caller is the node-status banner in a following
change.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

This commit is contained in:

DanS

2026-10-10 09:50:03 -05:00

co-authored by

Claude Opus 5.5

parent e025a314d1

commit 8c0a22b7bc

4 changed files with 272 additions and 9 deletions

									
										CMakeLists.txt
									
		+1
		
												View File
												
				@@ -716,6 +716,7 @@ set(APP_HEADERS

				    src/util/coalescing_writer.h

				    src/util/local_time.h

				    src/util/background_sampler.h

				    src/util/text_fit.h

				    src/util/amount_format.h

				    src/util/base64.h

				    src/util/single_instance.h