TextEditingValue default selection docs #96245
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…143452) ## Description This PR adds more documentation for `TextEditingController(String text)` constructor and it adds one example. #96245 was a first improvement to the documentation. #79495 tried to hide the cursor when an invalid selection is set but it was reverted. #123777 mitigated the issue of having a default invalid selection: it takes care of setting a proper selection when a text field is focused and its controller selection is not initialized. I will try changing the initial selection in another PR, but It will probably break several existing tests. ## Related Issue Fixes #95978 ## Tests Adds 1 test for the new example.
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This PR simply adds some docs about TextEditingValue's default selection, which is collapsed at index -1. This selection value of -1 is a constant source of problems in Flutter, but if we can't eliminate it for now, we need to clearly document what it is.
Partial fix for #95978