headerless window, undecoration

[Steven J Abner]

On Wed, Apr 16 2025 at 05:00:01 PM +0000, Steven J Abner 
<pheonix.sja at att.net> wrote:
> Managed to create undecorated window.

In case of any followers, the previous code has issues. I wish to 
correct information provided. Motif does work, at least on 2 window 
managers but with caveats. I think may even be a way to use 
override-redirect but still trying to get 100% with my systems.
 Firstly, I currently use a global 'bool wants_undecorated;' On window 
creation, one sets wants_undecorated = true; This will allow normal 
window creation. If using the method I proposed before, 1 WM does 
reparent, the other doesn't. Boolean value allows you to get reparent 
on both.
 On XCB_REPARENT_NOTIFY event pretty much the aforementioned code:

  if (wants_undecorated) {
    struct MWMHints {
      uint32_t flags, functions, decorations, input_mode, status;
    } hints = { 2, 0, 0, 0, 0 };

    xcb_intern_atom_cookie_t c0;
    xcb_intern_atom_reply_t *r0;
    c0 = xcb_intern_atom(session->connection, 0, 15, "_MOTIF_WM_HINTS");
    r0 = xcb_intern_atom_reply(session->connection, c0, NULL);
    xcb_change_property(session->connection, XCB_PROP_MODE_REPLACE, 
rp->window,
                        r0->atom, r0->atom, 32, sizeof(hints) >> 2,
                        &hints);
    free(r0);
  }
where 'rp->window' is retrieved from event.

 This is needed to solve not only WM's reparent issues, but a major 
issue with XCB_CONFIGURE_NOTIFY events. About 50% of the time, the old 
version would give invalid values if using 
xcb_translate_coordinates_reply() on one WM, and the other never 
configured correctly.

 Hope this helps,
Steve