Fix IconTintColorBehavior not tinting UriImageSource and TintColor binding not working on Windows

[myix765]

Description of Change

On Windows, the IconTintColorBehavior did not tint images with a URL source and in the CommunityToolkit sample, the ImageButton with the TintColor binding was not changing color when pressed. These issues did not happen on Mac or iOS. The issue was with the OnImageOpened() function not getting called with for URL images. There was a change made in a previous pull request #1370 that fixed an issue described in #1333 on Windows where applying the IconTintColorBehavior caused the image to not show up, but when reverting this change, the URL image was tinted correctly and the ImageButton worked. Reverting the change did not cause the issue in #1333 to reappear.

Below is an image of the tests I wrote in the sample solution to see the change:

This is what it looks like without the change:

Linked Issues

• Fixes [BUG] IconTintColorBehavior doesn't work for UriImageSource on Windows #1906
• Fixes [BUG] IconTintColorBehavior sample not working as expected on windows #1734

PR Checklist

• Has a linked Issue, and the Issue has been approved(bug) or Championed (feature/proposal)
• Has tests (if omitted, state reason in description)
• Has samples (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Changes adhere to coding standard
• Documentation created or updated: https://github.com/MicrosoftDocs/CommunityToolkit/pulls

Additional Information

Tested on Windows 10

[myix765]

@dotnet-policy-service agree

[brminnick]

Thanks @myix765! This update introduces a new bug where the image is not properly updated. Please look into this and ensure it is resolved before we can merge this PR.

Here's a screen recording of CommunityToolkit.Maui.Sample showing two new bugs:

1. The tinted image (red shield with checkmark) does not disappear when the dotnet bot is displayed
2. The red tinted imageimage does not properly overlay the original black tinted shield image when the dotnet bot is not displayed
   • Look closely and you'll see a red shield and a black shield image on the screen
   • The red shield should perfectly overlay the black shield image

For reference, here is a screen capture showing it working properly on iOS:

[myix765]

@brminnick Sorry about that, I neglected to verify that the other ImageButton still works. I made a change that only fixes Issue #1906 so I will close this pull request and make a new one.