Fix vertical scrollbar not rendering in RTL multiline TextBox - #14820
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LeafShi1 merged 1 commit intoJul 29, 2026
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Fixes #14801
Root Cause
Vertical scrollbar not rendered in RTL multiline TextBox on .NET 11 because
GetScrollBarPadding()doesn't checkWS_EX_LEFTSCROLLBARflag.Proposed changes
WS_EX_LEFTSCROLLBARflag; put scrollbar width inpadding.Leftif set,padding.Rightotherwise.RightToLeftproperty when handle not created.Customer Impact
Regression?
Risk
Screenshots
Before
After enable RTL, the vertical scrollbar of the multiline TextBox on the left disappears completely,
After
Vertical scrollbar renders correctly in RTL multiline TextBox on .NET 11
Test methodology
Test environment(s)