Hi!
I made a custom Key Configuration (this one) that just remaps letters to make my Colemak keyboard layout act like Qwerty in Blender. So S -> R, F -> T, etc.
Now, if I press Alt+A, the add menu comes up. But after about 0.5 s of holding Shift after that, a new window pops up with the 3D view in it. I’m pretty sure that is the “Duplicate Area Into New Window” function. The strange thing is that I have not changed that hotkey; it was Shift before, and it is still Shift. If I disable that hotkey, the problem goes away. Same thing happens with Shift+S for “Selection to…” menu: If I hold shift, a new Window pops up.
So, why does this happen, even though I have not changed the hotkey for “Duplicate Area Into New Window”?
EDIT: I found out that if I remove the line
kmi = km.keymap_items.new(‘screen.area_dupli’, ‘NONE’, ‘ANY’, shift=True)
from the file, the problem does not happen. I guess that if I include it, the action is marked as “User edited” or something, and works differently.