Toggle buttons like “Constraint proportions” or the visibility eyeball seem to retain focus, even after hitting the Escape key. Users have to click somewhere to remove focus.
This can be irritating if you click one of these buttons (or accidentally tab to one of them) and then try to use arrow keys to move the selected layer, or the Delete key to delete the layer, or the backslash “/” key to select a parent layer – all of which will do nothing until you use your mouse/touchpad to click on the layer again (even though it’s already selected).