"New filename" input doesn't handle Home/End keys

[n-st]

One can't jump to the beginning/end of the filename input with the Home/End keys.
According to its documentation, the Bricks Editor only supports Ctrl+A/Ctrl+E for that.

We could manually register an event handler and match on EvKey events with KHome/KEnd, but I'm not sure if/how it's possible to change the cursor position in the editor…

I'll just leave this here as a reference for anyone who encounters the same behaviour; it doesn't necessarily need to be "fixed". :)