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Fix fractional DPI drawing issues with popup menus #104

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Fix fractional DPI drawing issues with popup menus #104

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Copilot Mar 28, 2026
814dba8
Fix fractional DPI drawing issues with popup menus
Copilot Mar 28, 2026
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11 changes: 9 additions & 2 deletions src/Modern.Forms/MenuDropDown.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,12 @@ protected override void LayoutItems ()
width = sizes.Select (s => s.Width).Max ();
height = sizes.Select (s => s.Height).Sum () + 2;

var client_rect = new Rectangle (1, 1, width - 2, height - 2);
// Use the actual control's scaled dimensions if they are larger, to account
// for fractional DPI rounding that may produce a slightly larger buffer.
var layout_width = Math.Max (width, ScaledSize.Width);
var layout_height = Math.Max (height, ScaledSize.Height);

var client_rect = new Rectangle (1, 1, layout_width - 2, layout_height - 2);

StackLayoutEngine.VerticalExpand.Layout (client_rect, Items.Cast<ILayoutable> ());
}
Expand Down Expand Up @@ -140,7 +145,9 @@ public virtual void Show (Control parent, Point location)
}

LayoutItems ();
popup.Size = ScaleSize (new Size (width, height), 1 / (float)Scaling, 1 / (float)Scaling);
popup.Size = new Size (
(int)Math.Ceiling (width / Scaling),
(int)Math.Ceiling (height / Scaling));

Invalidate ();
popup.Show (location);
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