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I have an editable TextField with multiple lines, and when I press the `tab`  key, it inserts a tab character.  I'd like to be able to customize the behavior:
• The tab character is rendered as a single whitespace, not to a tab-stop.  If I do end up with the tab in the string, I'd like it to at least act like a tab.
• I might end up wanting other behavior.  I might replace this with a styled text editor, and I might want tab to increase/decrease list nesting levels for instance.

You can catch the key event before it gets to the textfield, do what you want with it, and consume it.

<https://developer.android.com/develop/ui/compose/touch-input/keyboard-input/commands#onkeypreviewevent_modifier|https://developer.android.com/develop/ui/compose/touch-input/keyboard-input/commands#onkeypreviewevent_modifier>