7

That is, how can I (from Lisp) create a frame similar to the one that x_create_tip_frame (called by x-show-tip in the C sources) creates when x-gtk-use-system-tooltips is nil?

My original guess was that the relevant part of the C code was this call:

x_default_parameter (f, parms, Qborder_width, make_number (0),
             "borderWidth", "BorderWidth", RES_TYPE_NUMBER);

Unfortunately, neither (set-frame-param (selected-frame) 'border-width 0) nor (make-frame '((border-width . 0))) (both inspired from the call above) yield a borderless frame. Still, x-show-tip works fine, so there must be a reliable way :)

Bottom line: How do I create a frame without a border added by the window manager?

4

Emacs 26 now has an undecorated frame parameter for this purpose:

(make-frame '((undecorated . t)))

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=25408#77

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