[release/9.0] WinForms ComboBox border and drop down button are not visible sometimes #12785
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Fixes dotnet#12744 ## Root Cause - Regression introduced by PRs 11529 and 11761, which modified how `ComboBox` controls would be drawn. ## Proposed changes - Revert code from PRs 11529 and 11761. ## Customer Impact - `ComboBox` button can be shown normally when switching RightToLeft property, or recreating the `ComboBox` for any other reason. ## Regression? - Yes ## Risk - Minimal ## Screenshots ### Before ### After ## Test methodology - Manual ## Test environment(s) - 9.0.100
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## release/9.0 #12785 +/- ##
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+ Coverage 74.83507% 74.83752% +0.00244%
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Files 3022 3022
Lines 630413 630395 -18
Branches 46798 46795 -3
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+ Hits 471770 471772 +2
+ Misses 155250 155238 -12
+ Partials 3393 3385 -8
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Backport #12737 to 9.0
Fixes #12744
Fixes #12590
Customer Impact
ComboBoxdrop down button disappears when switching RightToLeft property, or recreating theComboBoxfor any other reason.ComboBoxfocus border is not shown when TAB-ing into ToolStripComboBoxItemRoot Cause
ComboBoxcontrols was be drawn. It was an attempt to fix flickering of the control border when the mouse hovers over the control by reducing the number of times control is re-drawn, but we missed some cases where re-drawing was required. We don't have a better fix for the original flickering issue at the moment.Proposed changes
Regression?
Risk
Screenshots
Before
After
Test methodology
Test environment(s)
Microsoft Reviewers: Open in CodeFlow