Morphing Toolbar

a drawing toolbar that becomes each tool's options: pick the pen and the bar morphs into its colours and width, and its glyph flies over to become back.

key insight: every view is mounted the whole time and only the top of a stack shows. a change of view springs the bar to the new view's width, slides the two views a few pixels, and flies whatever they share across as a clone.

escape steps back, v, p, s, t and e pick a tool, and shift squares a shape or snaps a line.