LeftFluent NavigationViewItem hover invisible in Light theme
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- C#
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Description
Describe the bug
Problem
When using NavigationView with PaneDisplayMode="LeftFluent" in Light theme,
the mouse hover background feedback is completely invisible.
Root Cause
NavigationViewItemBackgroundSelectedLeftFluent references ControlFillColorDefault,
which resolves to #B3FFFFFF (70% white semi-transparent) in Light theme.
Overlayed on the #FAFAFA application background:
| State | Value | RGB |
|---|---|---|
| Background | #FAFAFA |
(250, 250, 250) |
| + Overlay | #B3FFFFFF |
+70% white |
| Result | #FEFEFE |
(254, 254, 254) |
| Delta | +4 ← imperceptible |
Dark theme works correctly (+13), and Left/LeftMinimal modes work correctly
(they use SubtleFillColorSecondary for hover).
To Reproduce
N/A
Expected behavior
N/A
Screenshots
OS version
Windows 10 22H2 19045.7291
.NET version
.NET 8.0
WPF-UI NuGet version
4.3.0
Additional context
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Search the theme resources for NavigationViewItemBackgroundSelectedLeftFluent and inspect its use of ControlFillColorDefault, comparing it with the SubtleFillColorSecondary hover resources used by Left and LeftMinimal modes. Confirm that LeftFluent hover feedback is visibly distinct in the Light theme while Dark theme and the other pane modes remain unchanged.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp
- Domain
- design, frontend
- Issue type
- Bug
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 74/100