'jumping' - line height changes

[idheitmann]

especially when using Luma theme, clicking into a block will change the height of the lines of the the parent block and the whole thing jumps up and down on the screen.

[fliprubin]

I'm experiencing the same issue on the bonofix theme. It moves so much that 1 out of 5 times I click a block I end up with the whole page selected.

[fortunehan]

I am experiencing the same issue, when the block is set to a header style greater than 2. I am using the awesome UI theme.