Text selection navigation with Shift+LeftArrow is buggy, depending on operating system

[shemetz]

This bug happens with all recent versions of react-froala-wysiwyg, including the most recent version 4.2.2, on Chrome.

To reproduce:

1. open a simple react-froala-wysiwyg sandbox -- https://codesandbox.io/p/sandbox/froala-react-wysiwyg-editor-59fx9z
2. write some text, example
3. click between the letter m and the letter p -- your caret will be placed there
4. hold Shift and press Right-Arrow -- you'll get text selection of the letter p
5. hold Shift and press Left-Arrow a few times

Expected: Text selection should become (empty) again, shrinking in the direction against the direction of expansion. After becoming empty, additional presses should select the text to the left of the caret - m, then am, then xam

Actual (bug) - in iOS: Text selection expands to the left, becoming a selection of mp. Pressing Shift+Left more keeps expanding selection to the left -- amp, xamp.

Actual (bug) - in Windows: Text selection shrinks correctly at first to (nothing), then expands once to the left, but then shrinks again (moving caret left). I see the selection becoming, in order: , m, , `a`, , x.
This bug does not happen in the normal web version of the Froala WYSIWYG editor -- compare https://froala.com/wysiwyg-editor/demo/

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This bug looks similar/identical to previous bugs reported for prime Froala:

froala/wysiwyg-editor#2740

froala/wysiwyg-editor#4669