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Test CTabItem rendering#3295

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Test CTabItem rendering#3295
basilevs wants to merge 1 commit intoeclipse-platform:masterfrom
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@basilevs basilevs commented May 10, 2026 •
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Pixel color verification for CTabItem's tabs.

A regression test for #3260 where tabs fail to render if
NSView.setClipsToBounds() is omited before scheduling redraw.

This test fails to reproduce the problem, but is useful as rendering is
not tested in this suite yet.

@basilevs basilevs force-pushed the test_ctabfolder branch 2 times, most recently from ce76b95 to 3ace3b9 Compare May 10, 2026 18:21
merks
merks reviewed May 10, 2026
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Comment thread ...wt.tests/JUnit Tests/org/eclipse/swt/tests/junit/Test_org_eclipse_swt_custom_CTabFolder.java Outdated
/* custom */
protected CTabFolder ctabFolder;
private Color RED;
private Color BLUE;
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@merks merks May 10, 2026

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It seems odd to use an all caps name for something that’s not a constant.

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@basilevs basilevs May 10, 2026 •
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Colors in SWT depend on Display, which I access via Shell, which is initialized after test starts. I could try to use Display.getCurrent() but this would be riskier (Display can be recreated). Therefore these are constants effectively but not in practice. Should I make them lowercase?

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Actually there are now Color constructors without a device and colors need not be disposed so they don’t really depend on a display/device.

When I see an all caps name, I expect it to static final, so yes, I’d prefer the name to match general expectations…

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I've made constants final using new constructors.

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github-actions Bot commented May 10, 2026 •
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Test Results

  175 files   -  7    175 suites   - 7   27m 59s ⏱️ + 1m 10s
4 708 tests  - 15  4 682 ✅  - 18   22 💤  - 1   4 ❌ + 4 
6 727 runs   - 85  6 554 ✅  - 95  157 💤  - 6  16 ❌ +16 

For more details on these failures, see this check.

Results for commit 0a65341. ± Comparison against base commit a4a774c.

This pull request removes 19 and adds 4 tests. Note that renamed tests count towards both. 
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_dollarSign
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_emptyString
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_letterA
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_letters
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16LE_null
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_AsciiLetters
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_Asciiletter
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_LotsOfLetters
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_letter
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_letters
…

org.eclipse.swt.tests.junit.Test_org_eclipse_swt_custom_CTabFolder ‑ test_tabsAreRendered(boolean, int)[1]
org.eclipse.swt.tests.junit.Test_org_eclipse_swt_custom_CTabFolder ‑ test_tabsAreRendered(boolean, int)[2]
org.eclipse.swt.tests.junit.Test_org_eclipse_swt_custom_CTabFolder ‑ test_tabsAreRendered(boolean, int)[3]
org.eclipse.swt.tests.junit.Test_org_eclipse_swt_custom_CTabFolder ‑ test_tabsAreRendered(boolean, int)[4]

♻️ This comment has been updated with latest results.

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basilevs commented May 10, 2026 •
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Windows CI is passing, Linux and MacOS are not. The test is passing on my MacOS. Configuration issue? The test seems trivial - it should work, as long as graphical context is available.

How do I get screenshots? They are saved to /tmp and are not archived.

@basilevs basilevs mentioned this pull request May 10, 2026
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@basilevs basilevs marked this pull request as draft May 10, 2026 20:16
@basilevs
Ensure that CTabItems are rendered
0a65341 
A regression test for eclipse-platform#3260 where tabs fail to render if
`NSView.setClipsToBounds()` is omited before scheduling redraw.

This test fails to reproduce the problem, but is useful as rendering is
not tested at all in this suite.
@basilevs basilevs marked this pull request as ready for review May 10, 2026 20:20
@basilevs basilevs marked this pull request as draft May 10, 2026 20:41
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