Fix flickery behavior for clicked elements in the workspace #635
Description
Bug Description
More and more, we have a problem with the "mousedown" state of elements in the workspace. Clicking on an element results in flickery UX, because you see the guidelines (and now help text for drop targets) for a split second, and then they're gone again.
Expected Behaviour
When clicking an element, none of the UI around it should flicker (show for a split second).
We can solve this in two ways: Add a delay (~100-200ms?) to not have them appear immediately, or only show them after dragging for ~1px. in jQuery UI's draggables, I usually resorted to a combination of both, but often the 'distance' based option (1px) is enough.
Steps to Reproduce
Screenshots
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