However Tab doesn't work. rather unpleasant.
if GTK can not support this, maybe these
actions should be bound to another keys like
{"Flip up/down" checked=flip_y SwapSides(V) a={"X"
"<Key>X"}}
{"Flip left/right" checked=flip_x SwapSides(H)
a={"Shift-X" "Shift<Key>X"}}
{"Spin 180 degrees" SwapSides(R) a={"Alt-X"
"Alt<Key>X"}}
{"Swap Sides" SwapSides() a={"Alt-Shift-X" "Alt
Shift<Key>X"}}
It is inconvenient to wander through menus for this
action every time.
These keys don't work:
{"Step Up" a={"Up" "<Key>Up"} Cursor(Warp,0,1,grid)}
{"Step Down" a={"Down" "<Key>Down"}
Cursor(Warp,0,-1,grid)}
{"Step Left" a={"Left" "<Key>Left"}
Cursor(Warp,-1,0,grid)}
{"Step Right" a={"Right" "<Key>Right"}
Cursor(Warp,1,0,grid)}