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This change blocks two selection handles from being able to be dragged simultaneously on iOS and the web, this matches the native behavior. On native Android both handles can still be dragged simultaneously this is the behavior observed on Google Keep/ Google Messages and Android's EditText. Also fixes an issue on iOS where the magnifier would not return after hiding when double tapping and dragging to select and then dragging outside the TextField area. The cause of this issue was because editableText.showMagnifier decides whether to update the magnifier position or show a new one based on whether it was visible, so when it was hidden and we attempt to update it's position, it would try to show a new magnifier which left the magnifier in a broken state. This change makes editableText.showMagnifier depend on whether a magnifier exists instead of just checking it's visibility. Similarly editableText.hideMagnifier now does not depend on the magnifier visibility, instead it internally (selectionOverlay.hideMagnifier) checks if the magnifier exists. Fixes #168578 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. --------- Co-authored-by: Renzo Olivares <roliv@google.com>