microsoft / microsoft/microsoft-ui-xaml

Setting a RichTextBlock's Style to a TextBlock style shows no error or warning nor the app breaks

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bug needs-triage
Dominant language
C++
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Forks
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Avg merge
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Merged PRs (30d)
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Description

### Describe the bug

In my case I had a BodyStrongTextBlockStyle in my RichTextBlock and the app worked normally when debugging. I didn't notice anything because I set the Paragraph's FontWeight in code, so the text showed up bold as I expected. I know it shouldn't work, I don't expect it to work. I didn't even notice that was there, so it took me a minute to realize what was wrong. The app doesn't break when debugging, only when opening outside Visual Studio, so it was annoying.

### Steps to reproduce the bug

Use a RichTextBlock with BodyStrongTextBlockStyle as its style.

### Expected behavior

To show an error or a warning.

### Screenshots

_No response_

### NuGet package version

WinUI 3 - Windows App SDK 1.6.1: 1.6.240923002

### Windows version

_No response_

### Additional context

Build 26100

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the issue with a RichTextBlock using BodyStrongTextBlockStyle under WinUI 3 / Windows App SDK 1.6.1, then trace how the invalid style assignment is handled when the app is launched outside Visual Studio. Done means the mismatch produces a clear error or warning instead of failing silently.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
desktop
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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