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Without this you end up with artifacts if the old theme used a gradient and the new theme sets the background. 
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🟡 Changes recommended
Gradient state is mutated before superclass argument and widget validation succeeds.
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Pull request overview
Clears stale CTabFolder gradients when setting a solid background.
Changes:
- Resets gradient state for solid backgrounds.
- Adds regression coverage for tab-row controls.
File summaries
| File | Description |
|---|---|
CTabFolder.java |
Clears gradient state and refreshes backgrounds. |
Test_org_eclipse_swt_custom_CTabFolder.java |
Tests replacing a gradient with a solid color. |
Review details
- Files reviewed: 2/2 changed files
- Comments generated: 1
- Review effort level: Balanced
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CTabFolder.setBackground(Color) kept a gradient set earlier, so the folder continued to paint gradient images behind the controls in its tab row. Controls without their own colour showed the stale gradient while the others showed the solid colour, which gave toolbar buttons of an inactive part stack mismatched backgrounds. Assisted-by: multiple AI agents and layers of automated tooling 🤖
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CTabFolder.setBackground(Color) kept a gradient set earlier, so the folder continued to paint gradient images behind the controls in its tab row. In the IDE this showed up as toolbar buttons of an inactive part stack with mismatched backgrounds: controls without their own colour showed the stale gradient, the others the solid colour. setBackground(Color) now clears the gradient, as CLabel already does. A new CTabFolder test fails without the change and passes with it, and the existing CTabFolder tests pass on GTK.