Found trivia fix for preview border going missing. MAGN-631
Add Left, Top, ZIndex property to EndlessGridViewModel. To remove error in debug. (MAGN-849)
These properties replace the EndlessGrid transformation for its position, seems to improve the frame rate during navigation.
1. Renamed timer
2. Made timer stop after one tick
Code cleanup for Tooltip fading in delay timer.
Merge pull request #867 from l2obin/MAGN-849

This is a logical enhancement of previous implementation that made use of Transform (which is causing slight issue as per WPF performance guidelines). For that reason, I am accepting this merge in the interest of having it tested earlier.
Merge pull request #863 from kah-heng/MouseOverInfoBubbleTimerFix_ChocoButterUI

This fixes a rather important and easy-to-reproduce crash when mouse moves away from out-ports, so I'm accepting this pull request in the interest of having it tested earlier.
Merge pull request #854 from kah-heng/InfoBubbleBorderImprovement_ChocoButterUI

The fix seems reasonable and harmless. Accepting this for earlier testing.
Merge branch 'ChocoButterUI' into OpenAndPlayCmds
Implemented "RunCancelCommand" recordable command
Updated both "Run" and "Cancel" buttons to use "RunCancelCommand"
Added TestRunCancelCommand and TestCreateNodesAndRunExpression test cases