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An attempt to fix #3149
the code is not ready to be merged, but the behavior can be tested at
https://rawgit.com/ajaxorg/ace/tab-key-navigation/demo/autoresize.html
When keyboard focus first goes into the editor, and mouse is not pressed, or when esc key is pressed twice, editor allows the next Tab key to be handled by the browser.
I am not sure if this should be a behavior that is on by default and can be disabled, or an extension that needs to be enabled explicitly.