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Fix disabled RichTextBox multiline text rendering in Dark Mode #14216

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Fix disabled RichTextBox multiline text rendering in Dark Mode #14216

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e0c1c1f
Fixes #14203
Jan 16, 2026
800a8da
Handles feedback
Jan 20, 2026
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8 changes: 6 additions & 2 deletions src/System.Windows.Forms/System/Windows/Forms/Controls/RichTextBox/RichTextBox.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3445,17 +3445,21 @@ protected override unsafe void WndProc(ref Message m)
// Paint the background
g.FillRectangle(SystemBrushes.ControlDark, ClientRectangle);

RECT formattingRect = default;
PInvokeCore.SendMessage(this, PInvokeCore.EM_GETRECT, (WPARAM)0, ref formattingRect);
Rectangle textBounds = formattingRect;

// Paint the text
TextRenderer.DrawText(
g,
Text,
Font,
ClientRectangle,
textBounds,
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@SimonZhao888 SimonZhao888 Jan 19, 2026

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Why don't we use ClientRectangle? I think what really makes a difference is the modification to TextFormatFlags.EndEllipsis, because it indicates that when the text is too long, it will no longer be omitted with "...".

SystemColors.GrayText,
TextFormatFlags.Left
| TextFormatFlags.Top
| TextFormatFlags.WordBreak
| TextFormatFlags.EndEllipsis);
| TextFormatFlags.TextBoxControl);

return;
}
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