Re: Creating a "borderless" frame (without WM chrome) (was Re: Could x-show-tip be reimplemented in Elisp? How does one create borderless frames from Elisp?)

[Chris Feng]

>> * add a frame parameter to frame_parms in frame.c, say "chromeless"
>
> I'd prefer "decorated" as in gtk_window_set-decorated.

Agree.  We call it "decoration" in X almost exclusively.

>> * add an x_set_chromeless slot in each of frame_parm_handler
>> x_frame_parm_handlers[], frame_parm_handler w32_frame_parm_handlers[],
>> frame_parm_handler ns_frame_parm_handlers[]; for the last two point to 0 for
>> now; for the first one point to a new function x_set_chromeless.
>> * In x-create-frame, add something like
>>      x_default_parameter (f, parms, Qchromeless, Qnil,
>>                           "chromeless", "Chromeless", RES_TYPE_BOOLEAN);

I don't think we need to make this customizable through X resources,
so the fifth and sixth parameters to x_default_parameter should be
NULL.

> For X I doubt that it's always possible to add/remove the decorations of
> an existing frame.

Yes but it may require remapping if it's already mapped.