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Speedup mouseMoveEvent

Tomaz Canabrava requested to merge work/fix_color_arrow_heads into master

items(pos) is really expensive, and would consume 20 - 25% of the program time with too many shapes on view, so we should only call it when we are actually doing something on screen.

This patch makes updaing multiple edges at the same time much smoother when we do not have the tooltip icon visible on screen by not calling items all the time

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