Steps to Reproduce

1. Build a basic flutter app with a single textfield/textformfield and a TextEditingController
2. Add an inputFormatter
3. Have a button to trigger setting the TextEditingController '.text' property and the input formatters are not triggered/applied.

Expected results: The inputFormatters get applied instead of just ignoring them entirely. My specific use case is building an onscreen keyboard and inputting keystrokes manually to a TextEditingController.

Actual results: The value is set no matter what the inputFormatters are.

I am not sure why but there was another issue(#30369) posted for this exact same reason and it was closed due to operating "as designed"? Not sure how that's supposed to be the designed way but would love more of an explanation.

Flutter version:
Flutter 2.10.4 • channel stable • https://github.com/flutter/flutter.git
Framework • revision c860cba (3 months ago) • 2022-03-25 00:23:12 -0500
Engine • revision 57d3bac3dd
Tools • Dart 2.16.2 • DevTools 2.9.2