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Visual Inconsistency in MS Form While Zooming in the resolution 150%
Description
When running a basic Windows Forms application on a display with 125% or 150% DPI scaling, the form's border renders as three horizontal lines of varying thickness. This creates a visual inconsistency and makes it difficult to identify the actual form boundary.
Screenshots
- 150% Scaling:
- 125% Scaling:
Steps to Reproduce
1.Create a basic WinForms application (no custom styling or overrides).
2.Run the app on a display with 125% or 150% DPI scaling.
3.Observe the top border of the form.
4.For exaggerated results, test with 500% scaling.
Actual Behavior
-
The top border appears as three horizontal lines:
- First line: light and thin
- Second line: noticeably thicker
- Third line: thickest
-
This layered rendering causes confusion about the true form boundary.
Expected Behavior
The form border should render as a single, solid line, regardless of DPI scaling.
Questions
-
Is this a known rendering issue in WinForms on high DPI displays?
-
Does it impact usability or accessibility?
-
Are there any recommended workarounds or fixes?
Environment
.NET Framework / .NET - .NET Framework Windows Version - 11 Display Scaling - 125%, 150%, 500% (test) Custom Styling - None Additional Notes No custom drawing or styling is applied.
Issue persists across multiple scaling levels.
