Setting `Insert` keyboard shortcut for "Add child and start edit" doesn't work and cannot be set back to `Tab` afterwards

[Arakade]

When I set the Insert key for "Add child and start edit" then use on a node, no child is created. (Insert is the key used in FreeMind by default so I'd hoped to not relearn that shortcut.) Realising the problem I press the "Edit code" button to try to set the shortcut back to Tab but that moves the input focus back to "Edit code"! (without setting the shortcut!) Next I thought to just type in "Tab" and while I can delete the text from the "Key code" input area, I then cannot type in it!

Thanks for an otherwise very handy mind-mapping tool! (I know bug reports can come across all whiny so I hoped to give a little positive to balance 😉)

[raydac]

you can try 1.5.2-SNAPSHOT