A long touch, a canceled touch or a second finger drops the tool press in
progress. The tool used to get a plain mouse-up, which it cannot tell from a
release: the options the drag changed (the Polygon tool's sides set with the
arrow keys) were stored, and a shape tool pressed and held still opened its
size dialog.
Session::drop_tool_press undoes the press's interaction, sends the tool
Escape as during a drag, and then a release that returns it to rest without
storing the tool's options. What the tool asks of the UI along the way is
dropped.
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