XDG-shell: Minimize works once only

[tiagovignatti]

When using xdg shell, minimize works only once but not twice.

More specifically, if the user click/tap in the minimize icon of content_shell and then bring it back using super+tab, the next time minimize won't simply work.

The problem is in ui/desktop_aura/desktop_window_tree_host_wayland.cc. When click happens in minimize icon, Chromium code dispatches an event that will trigger views::DesktopWindowTreeHostWayland::Minimize(), consequently forward to GPU process a WLShellSurface::Minimize(). After going through the (Wayland) wire, Weston hides the window and the world is perfect. But when Weston triggers a switch back event (super+tab) to the client, nothing will be triggered in Chromium/Ozone-Wayland side to restore the visibility state again; it still thinks that the client is hidden. So we need to see what kind of method in DesktopWindowTreeHostWayland is called when this happen and fix the state_ flag behavior.

[nicoguyo]

I think this should be done in HandleNativeWidgetActivationChanged method.
This method is called when window gain pointer focus.

IMHO this should be done when weston notifies window's surface is activated or gain keyboard focus.

[nicoguyo]

PR 261 fix this issue: #261.

[kalyankondapally]

Fixed.