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Hi @Shadow-NewBee thanks for the PR! For this PR to be reviewed/submitted you must provide tests to guard against future regressions (instructions can be found here: https://github.com/flutter/flutter/wiki/Running-and-writing-tests). Also we should probably not prevent all TextInputFormatters from formatting the text while text composition is in progress.

@Shadow-NewBee Do you have plans to follow up soon-ish on the feedback provided above?

@Shadow-NewBee Do you have plans to follow up soon-ish on the feedback provided above?

Yeah, But I had trouble to make test, in addition, some default checks such as Mac framework_tests showed failed, but I do not how to fix it.
I Need help. Do you have any suggestions?
Thanks.

@Shadow-NewBee Thanks for the contribution! I was wondering if this fix can directly lands on the formatter.

Also you need to update the checklist if you can follow up the feedback

This behavior breaks some tests so the framework tests failed.

One of the failing test's log:

00:28 +798 ~2: /opt/s/w/ir/k/flutter/packages/flutter/test/widgets/editable_text_test.dart: formatter logic handles repeat filtering                                                                   
══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following TestFailure object was thrown running a test:
  Expected: <4>
  Actual: <3>

When the exception was thrown, this was the stack:
#4      main.<anonymous closure> (file:///opt/s/w/ir/k/flutter/packages/flutter/test/widgets/editable_text_test.dart:5627:5)
<asynchronous suspension>
<asynchronous suspension>
(elided one frame from package:stack_trace)
...

This was caught by the test expectation on the following line:
  file:///opt/s/w/ir/k/flutter/packages/flutter/test/widgets/editable_text_test.dart line 5627
The test description was:
  formatter logic handles repeat filtering
════════════════════════════════════════════════════════════════════════════════════════════════════

This pull request executed golden file tests, but it has not been updated in a while (20+ days). Test results from Gold expire after as many days, so this pull request will need to be updated with a fresh commit in order to get results from Gold.For more guidance, visit Writing a golden file test for package:flutter.

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

I am going to close this one for now. If you have time to address the feedback feel free to re-open.