Tooltip is in the way

[Charles]

The icon tooltip is often in the way, see video.
The tooltip of the source toolbar should go away on mousedown.

Seems related to this:

Toolbar buttons require an extra click

When holding the left mouse button over a triangle button, the toolbar pops out. V7: While the mouse button is pressed, we can go to the wanted button and then release the mouse. Command starts. V8: We need to release the mouse button first and then click the wanted button. The extra click is not nice.