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0d6927cb61
Changes drag release logic so that an armed refresh is only canceled if the user has scrolled back up beyond the point where the refresh indicator was armed. (Fixes https://github.com/flutter/flutter/issues/138848.) This is the minimal change I found could be made to restore something like the behavior that I would expect. This may still need a bit of work, because it only masks the second issue I mentioned, that releasing a drag can cause the scroll position to be animated back up from the release point. There is actually a bug about that: https://github.com/flutter/flutter/issues/6052. I would like to see that bug fixed too. This PR doesn't address that, but makes it harder to hit that issue. @Piinks this is a recreation of #139015 (since I couldn't figure out some issue with a git detached branch, so I fixed the PR and I'm re-submitting it). This version includes one line that was somehow accidentally dropped from the original PR. This will hopefully fix the test failures. However, I don't have a clue how to write a test for a Flutter UI widget. I'll try to figure that out, but also I don't have a lot of time to work on this. I would appreciate at least some user testing to verify that the new behavior is much more intuitive than the old behavior. - [?] All existing and new tests are passing.
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