Flutter should respect custom system-wide text selection toolbar buttons #107603
Description
On some platforms, it's possible to write an app that adds a custom button to the system-wide text selection toolbar. For example, here the Android app AnkiDroid has added the "Anki Card" button to my text selection toolbar, and it appears in any app, such as the Google app here.
Flutter should respect these added buttons, so that in any Flutter app, the buttons that the user has added to their device show up in the default text selection toolbar just like in any native app.
Scope
This issue does not include allowing Flutter apps to add system-wide buttons. It's about the reverse problem.
Platforms
| Platform | Behavior | Related Work |
|---|---|---|
| Android | Apps can add custom system-wide buttons (relevant article). Is there a way for Flutter to read what these buttons are and trigger them? | #139361 |
| iOS | ? | |
| Mac | ? | |
| Linux | ? | |
| Windows | ? |