port: upstream PRs #1311 (inter-word spacing fix) and #1322 (zip early exit)

PR #1311: Replace separate spaceWidth + getSpaceKernAdjust() with a
single getSpaceAdvance() that combines space glyph advance and kerning
in fixed-point before snapping to pixels, eliminating +/-1 px rounding
drift in text layout.

PR #1322: Add early exit to fillUncompressedSizes() once all target
entries are matched, avoiding unnecessary central directory traversal.

Also updates tracking docs and verifies PR #1329 (reader utils refactor)
matches upstream after merge.

Made-with: Cursor

chat-summaries/2026-03-08_17-30-summary.md

@@ -0,0 +1,43 @@
+# Port Upstream PRs #1311, #1322 + Verify #1329
+
+**Date:** 2026-03-08
+**Task:** Port two upstream PRs and verify alignment of a previously-ported PR that was recently merged.
+
+## Changes Made
+
+### PR #1311 -- Fix inter-word spacing rounding error (UNMERGED, ported as mod feature)
+
+Replaced `getSpaceKernAdjust()` with `getSpaceAdvance()` which combines space glyph advance and flanking kern values into a single fixed-point sum before pixel snapping, fixing +/-1 px rounding drift in inter-word spacing.
+
+**Files modified:**
+- `lib/GfxRenderer/GfxRenderer.h` -- replaced declaration
+- `lib/GfxRenderer/GfxRenderer.cpp` -- replaced implementation (single-snap pattern)
+- `lib/Epub/Epub/ParsedText.h` -- removed `spaceWidth` parameter from 3 internal functions
+- `lib/Epub/Epub/ParsedText.cpp` -- updated all 4 call sites to use `getSpaceAdvance()`
+
+### PR #1322 -- Early exit on fillUncompressedSizes (MERGED, ported for immediate use)
+
+Added `targetCount` variable and early `break` when all ZIP central-directory targets are matched.
+
+**Files modified:**
+- `lib/ZipFile/ZipFile.cpp` -- 5-line addition
+
+### PR #1329 -- Reader utils refactor (MERGED, verification only)
+
+Confirmed our existing port matches the upstream merged version (commit `cd508d2`) line-for-line. No code changes needed.
+
+### Tracking documentation updated
+
+- `mod/docs/upstream-sync.md` -- added #1311, #1322; updated #1329 status to MERGED
+- `mod/prs/MERGED.md` -- added detailed entries for #1311 and #1322; updated #1329 author and status
+
+## Build Result
+
+SUCCESS -- zero compiler errors/warnings from our changes. Only pre-existing i18n translation warnings.
+
+## Follow-up Items
+
+- #1311: Will be dropped during next sync if/when merged upstream
+- #1322: Will be dropped during next sync (already merged upstream)
+- #1329: Will be dropped during next sync (already merged upstream)
+- Hardware testing recommended: verify text layout rendering after spacing fix (#1311)