Text Selection color not respecting brightness (Missing TextSelectionThemeData equivalent)🐛

[Michal-MK]

Describe the bug
When selecting text in e.g. a TextBox, the selected text color does not match adjust based on accent brightness.

Setting "blue" theme color in Windows:

Results in:

While in Flutter:

The text stays black making it hard to read due to low contrast. In the FluentThemeData I found that there is no option to change text selection color, only the accentColor is used instead.

Expected behavior
Text on dark accent colors should be white.

environment:
  sdk: '>=3.0.1 <4.0.0'
 
dependencies:
  flutter:
    sdk: flutter

  fluent_ui: ^4.7.0

[bdlukaa]

This would only apply to the TextBox (and related) widget, since we don't really have control over the SelectableText widget for now.

Yet, there is still a blocker for this: flutter/flutter#99231
Even in material's TextSelectionThemeData, there isn't a property to change the text color to have a better contrast with the background.

I like the idea of having a text selection theme data, but I don't like the idea to implement it without the issue mentioned above being fixed first.

On the other hand, I'd suggest to use a lighter shade of the accentColor as the default selection color.

[Michal-MK]

I see. I am using the system accent color, so I cannot control that variable. I thought that the material selectable text style supported that (but I did not try). Let's see what flutter team comes up with then.

[bdlukaa]

It is also possible to use DefaultSelectionStyle in the FluentApp.builder method to wrap a custom selection style for the entire app.