[calixteman]

The CSS only fetches an icon once its element is rendered, so the toolbar is first painted without icons and the menus load theirs when first opened.

Preload the toolbar icons from viewer.html (without crossorigin, since CSS images from resource:// are fetched without CORS), and warm the image cache up with the icons of the hidden UI once the first page is rendered.

[github-actions]

Viewer preview

🗑️ Viewer previews removed.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.61%. Comparing base (bb386fc) to head (ce31961).
⚠️ Report is 51 commits behind head on master.

Files with missing lines	Patch %	Lines
web/app.js	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #22457      +/-   ##
==========================================
- Coverage   90.54%   88.61%   -1.94%     
==========================================
  Files         276      276              
  Lines       68557    73573    +5016     
==========================================
+ Hits        62077    65198    +3121     
- Misses       6480     8375    +1895     

Flag	Coverage Δ
integrationtest	69.67% <0.00%> (+0.05%)	⬆️
unittest	62.87% <ø> (+0.03%)	⬆️
unittestcli	60.45% <ø> (+0.05%)	⬆️

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[codspeed]

Merging this PR will degrade performance by 8.13%

⚡ 1 improved benchmark
❌ 4 regressed benchmarks
✅ 83 untouched benchmarks
⏩ 174 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	Lexer.getObj: paths (bug1743245.pdf)	26.5 ms	32.1 ms	-17.37%
❌	OperatorList.addOp: paths and clips (bug1703683_page2_reduced.pdf)	6 ms	6.7 ms	-11.18%
❌	EvaluatorPreprocessor.read: paths (bug1743245.pdf)	59.1 ms	65.8 ms	-10.22%
❌	Lexer.getObj: text (issue12963.pdf)	18.4 ms	20.5 ms	-10.2%
⚡	getUnicodeRangeFor (bug1473809.pdf)	25.2 ms	22.8 ms	+10.6%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing calixteman:preload-viewer-icons (ce31961) with master (6619bf0)}

Footnotes

1. 174 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[timvandermeij]

Looks good like this; thank you!