[Xcb] Window Manager already running.

[Peter Harris]

Fernando Virgens wrote:
> how can i check wheter a Window Manager is already running?

Set XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT on the root window using
xcb_change_window_attributes_checked. If you get an XCB_ACCESS error,
another window manager is already running. If not, remember to deselect
XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT before launching your window manager.

Peter Harris

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