Improvements to behavior for gizmo tool-tips.
- 2D gizmos no longer cancel tool-tips on cursor motion
(matching the behavior of UI widgets).
- 3D gizmos still close on motion since 3D gizmos may have a large
on-screen area which would cause them to stay visible even after the
cursor has been moved a large distance. The motion threshold is used
so they don't close on unintended cursor motion.
- Changing highlighted gizmo now cancels the tool-tip & resets the timer.
BF-admins agree to remove header information that isn't useful,
to reduce noise.
- BEGIN/END license blocks
Developers should add non license comments as separate comment blocks.
No need for separator text.
- Contributors
This is often invalid, outdated or misleading
especially when splitting files.
It's more useful to git-blame to find out who has developed the code.
See P901 for script to perform these edits.
Displaying the labels tip immediately feels too intrusive,
make this work more like regular tooltips, displaying more quickly.
Tooltips can now uses multiple passes, each pass with it's own delay
for the next pass to show.
Move timer and tip out of button code,
now the only requests a tooltip,
passing a creation callback to run.
Needed for manipulators in 2.8,
also helps de-duplicate logic - since we never want
multiple tool-tips showing at once.
