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I opened a new window, I made it fullscreen and then set it to always on top with XSendEvent on _NET_WM_STATE to set _NET_WM_STATE_ABOVE and then I XFlush'ed. This makes the window appear on top of everything this is great.

Aside: I then draw the screenshot of the desktop to that window and overlay it with a 50% opacity black transparent layer.

So now the issue I am having is that placement is right and it is correct in that it is over the special UI (dock and menu bar) in that you cannot click it. But when I click in the window, the special UI just appears through. You cannot click on it, it is just appearing above my window.

Is there any window properties I can set to fix this issue?

Here is a screenshot showing before I click in the window:

Here is screenshot showing after i click in the window, the special ui appears through (while not clickable - which is good)

Replication

I can replicate this situation exactly on your system. Its a released firefox addon. Let me know please and we can chat using stackoverflow and i can walk you through to replicate.

yatg
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    Could you try with a very simple fullscreen window, e.g. calling [gtk_window_fullscreen](https://developer.gnome.org/gtk3/stable/GtkWindow.html#gtk-window-fullscreen) on an empty GTK+ window? If it has the same problem then it's likely the WM's fault. – Johannes Sasongko Jul 31 '15 at 02:21
  • Thanks @JohannesSasongko I'll test out and report back :) – yatg Jul 31 '15 at 17:06

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