cool, look like we are talking from the same point of view… ! if i don’t do mistake, uix speaking, we have just toolbar diff.
?? maybe i do not understand, but i think that work for me (debian7). when a panel is stacked, if it is masked, menu/window/panel bring the panel to the top of the stack.
one (should be) is already done : bring to top, is it useful to (1) add a highlight ?
What do you think to (2) bold opened panels ? (3) current canvas ?