With current Weston master (304996d182874ded26adce40ce1c29210fc5352b), Weston's desktop-shell will map a surface, which has a wl_shell_surface, but has not issued set_toplevel. This can be easily tested by commenting out line clients/simple-touch.c:314, the one calling wl_shell_surface_set_toplevel(touch->shell_surface);, and running simple-touch. On the very next repaint, the window appears on screen, but does not participate in window management like Win+tab switching or activation. With the above modification, the simple-touch surface should not be mapped at all. Thanks to bug #77521 for making me try this.
commit ef6a7e46eb28d66ccb6d88fa81a55d1a106d632a Author: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com> Date: Wed Apr 30 14:15:14 2014 +0300 shell: Don't map surfaces of type SHELL_SURFACE_NONE When commit 07926d90 factored out the code that chooses in which layer a surface is added to, it changed the behavior for surfaces with no type. Instead of not adding it to any layer, the surface is added to the current workspace. This patch restores the old behavior. Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=77527
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