XCB_ICCCM_WM_STATE_WITHDRAWN

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C)
alias XCB_ICCCM_WM_STATE_WITHDRAWN = xcb_icccm_wm_state_t.XCB_ICCCM_WM_STATE_WITHDRAWN

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