Re: "Final" version of tty child frames

[Gerd Möllmann]

martin rudalics <rudalics@gmx.at> writes:

> Building complains here as
>
> In file included from ../../src/term.c:30:
> ../../src/lisp.h: In function ‘Ftty_display_pixel_height’:
> ../../src/lisp.h:406:24: warning: ‘height’ may be used uninitialized 
> [-Wmaybe-uninitialized]
>   406 |     XIL ((EMACS_INT) (((EMACS_UINT) (n) << INTTYPEBITS) + Lisp_Int0))
>       |                        ^
> ../../src/term.c:4907:14: note: ‘height’ was declared here
>  4907 |   int width, height;
>       |              ^~~~~~
> ../../src/lisp.h: In function ‘Ftty_display_pixel_width’:
> ../../src/lisp.h:406:24: warning: ‘width’ may be used uninitialized 
> [-Wmaybe-uninitialized]
>   406 |     XIL ((EMACS_INT) (((EMACS_UINT) (n) << INTTYPEBITS) + Lisp_Int0))
>       |                        ^
> ../../src/term.c:4896:7: note: ‘width’ was declared here
>  4896 |   int width, height;
>       |       ^~~~~

That's code like this:

{
  int width, height;
  tty_display_dimension (display, &width, &height);
  return make_fixnum (height);
}

So width and height are returned by the call to tty_display_dimension.
TBH, I can't make sense of the warning. FWIW, clang doesn't complain.
Don't know what's the usual way is to placate GCC here. What version is
that BTW?

> I cannot test much because I hardly ever use Emacs in a terminal window.
> Setting size and position of the child frame work seamlessly.  I can
> move the child frame completely out of the parent (but have not tried
> what happens when it completely covers the parent) or make it invisible
> and visible again.

👍

> One thing I noticed is that changing the background color works only
> after I changed something like the position or size.  

Probably a SET_FRAME_GARBAGED missing somewhere, or something like that.

> Also I would like to get rid of those |+- borders. What would I have
> to do?

If you want to get rid of the border completely add a frame parameter
(undecorated . t), Default if no no undecorated is specified, it to not
draw borders.

If you want Unicode chars instead, you could call
standard-display-unicode-special-glyphs.