Created attachment 126486 [details]
Screenshot to show tags and bar in window manager *awesome*

Using Linux 4.8-rc5, with X.Org X Server 1.18.4, certain parts of the screen do
not update right away. This happens in Xfce 4.12 [1] and the window manager
*awesome* 3.5.9 [2].

1. Changing a Firefox window from maximum to “reduced”/“normal” size, the part
were the Firefox window isn’t present anymore, is still present. Switching
between windows often fixes this.

2. In the window manager *awesome* the top bar is not updated when changing
tags (think of virtual screen, although different). See the attached screen,
which doesn’t show the problem, as doing the screenshot didn’t capture it,
despite me seeing it.

[1] https://www.xfce.org
[2] https://awesomewm.org