Description

Slider value indicator gets disposed even if the value indicator is active. Currently if the Slider gets removed while it is activated than the value indicator remains on the Overlay.

Related Issues

Closes #55787

Tests

I added the following tests:

flutter/packages/flutter/test/material/slider_test.dart

test using context 'Slider removes value indicator from overlay if Slider gets disposed without value indicator animation completing.'

flutter/packages/flutter/test/material/range_slider_test.dart

test using context 'Range Slider removes value indicator from overlay if Slider gets disposed without value indicator animation completing.'

Checklist

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• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I signed the CLA.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
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• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.
• The analyzer (flutter analyze --flutter-repo) does not report any problems on my PR.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Did any tests fail when you ran them? Please read Handling breaking changes.

• No, no existing tests failed, so this is not a breaking change.
• Yes, this is a breaking change. If not, delete the remainder of this section.
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