How to reproduce:
1. Open attached project ("PivotSettingIssue.zip")
2. Open Scene called "BugDemonstration"
3. Play the game
4. In Hierarchy select Canvas -> BugDemoText
5. Make Game window active by pressing somewhere in the Game view
6. Tap "SpaceBar" multiple times
7. In Hierarchy deselect BugDemoText, by clicking on another GameObject
8. Make Game window active by pressing somewhere in the Game view
9. Tap "SpaceBar" multiple times

Expected result: No matter which GameObject is selected the "BugDemoText" GameObject should not move in Game window when changing its Pivot
Actual result: When "BugDemoText" is not selected and when you are changing its Pivot GameObject moves

First introduced in: 2017.3.1p1
Reproducible with: 2018.2.0a4, 2018.2.0a3, 2018.1.0b11, 2018.1.0b10, 2017.3.1p4, 2017.3.1p1
Not reproducible with: 2018.2.0a2, 2018.2.0a1, 2018.1.0b9, 2018.1.0a1, 2017.3.1f1, 2017.2.2p1, 2017.1.3p1, 5.6.5p2, 5.6.0a1