Override left and right keys of tab tree (switch tab instead)
Disable global shortcuts while configuration dialog is open

Global shortcuts need to be disabled in configuration dialog for user to
be able to use/remap currently mapped global shortcuts.
Tests: Wait actively for conditions
Check file size of edited item

Modified file can have same modification date/time if file is modified
too quickly (open, write, close with script).
Tests: Use RIGHT key to focus test tab
Tests: Fix returning errors from "keys" command and check selected