Space pressed after a tool's press has begun (Pencil, a brush, a shape, a
selection drag) switched the cursor to the hand but panned nothing: the pan
starts only with Space down at the press. It is ignored now, so the cursor keeps
the tool's own.
Test: space_during_a_pencil_drag_keeps_the_pencil_cursor (fails without the fix:
Grab instead of the pencil's crosshair).