Hard to read text while editing a textbox in the InfiniteCanvas control

[michael-hawker]

Describe the bug

Editing text in the InfiniteCanvas appears to have some overlay making it hard to read the text, see the screenshot below.

• Is this bug a regression in the toolkit? If so, what toolkit version did you last see it work:

Steps to Reproduce

Steps to reproduce the behavior:

1. Go to InfiniteCanvas sample in sample app
2. Add a textbox
3. Start typing
4. Notice that there's some white text overlaid making it hard to read as you type, if you click out and stop editing, it goes away.

Expected behavior

Able to read text while editing without white overlay.

Screenshots

Environment

NuGet Package(s): 

Package Version(s): 

Windows 10 Build Number:
- [ ] Fall Creators Update (16299)
- [ ] April 2018 Update (17134)
- [ ] October 2018 Update (17763)
- [ ] May 2019 Update (18362)
- [x] Insider Build (build number: 19592)

App min and target version:
- [ ] Fall Creators Update (16299)
- [ ] April 2018 Update (17134)
- [ ] October 2018 Update (17763)
- [ ] May 2019 Update (18362)
- [ ] Insider Build (xxxxx)

Device form factor:
- [ ] Desktop
- [ ] Xbox
- [ ] Surface Hub
- [ ] IoT

Visual Studio 
- [ ] 2017 (version: )
- [ ] 2019 (version: ) 
- [ ] 2019 Preview (version: )

Additional context

Again not sure if this is just happening on Insider build, but noticed it in both Store version and local dev version of Sample App.

If this is a regression, I'm not sure of the last version it worked.

[Kyaa-dost]

@michael-hawker I have tried this multiple times in different theme settings, sizes, font styles, and I am still not able to reproduce this bug. Wondering how it showed up as overlaid text for you 🤔

[deanchalk]

I’ve been working in this area of the code today on another related issue. Would be happy to try and get to the bottom of it if you assign to me - thanks

[Kyaa-dost]

@deanchalk are you able to reproduce this?

[deanchalk]

@deanchalk are you able to reproduce this?

I think I know how to, will try and get to the bottom of it

[deanchalk]

@Kyaa-dost - I tried, but simply couldn't reproduce this issue, either with the store app or debugging the code

[salmanmkc]

Working on this

[michael-hawker]

Figured out that this is specific to running the app in dark theme. In light theme it appears to work correctly.