bug#53839: 29.0.50; Strange bug causes tool bar to be overwritten

[martin rudalics]

> On any Motif or Lucid build, start Emacs with `-q', making sure that the
> splash screen is displayed.  A single pixel at the bottom of the tool
> bar will be overwritten by the window underneath it, until the frame is
> resized again.
>
> If I comment out this part of xfns.c:
>
>        /* As long as tool_bar_resized is false, effectively try to change
>     F's native height.  */
>        if (NILP (fullscreen) || EQ (fullscreen, Qfullwidth))
>    adjust_frame_size (f, FRAME_TEXT_WIDTH (f), FRAME_TEXT_HEIGHT (f),
>                       1, false, Qtool_bar_lines);
>        else
>
> The problem goes away, but I can't figure out why that is.

I cannot reproduce that here, neither with the release branch nor with
master.  See the attached screenshot and notice one pixel between tool
bar and root window that comes from 'tool-bar-border'.

martin

Lucid-master-emacs-q.png
Description: PNG image