A few bad frames when icon on terminal tabs view first becomes visible

[mjbvz]

Testing #122242

1. Make sure the terminal tabs view is collapsed down so that only icons are visible
2. Now make sure you have a single terminal so that the tabs are no longer visible
3. Now create a second terminal

Bug

There are a few frames where the text label from the first terminal is visible (in the video, notice the ba... in the top tab which quickly becomes hidden a few frames later):

Screen.Recording.2021-04-27.at.12.13.06.PM.mov

[mjbvz]

Also seems fixed in the new insiders