bug#51975: 29.0.50; fit-frame-to-buffer calculates frame width incorrectly on X11 with Gtk 3

[martin rudalics]

> The function calculates frame width one column too small in regard to
> displayed buffer which results in text being wrapped around and extra line 
added
> to the frame.

See

‘no-special-glyphs’
     If this is non-‘nil’, it suppresses the display of any truncation
     and continuation glyphs (*note Truncation::) for all buffers
     displayed by this frame.  This is useful to eliminate such glyphs
     when fitting a frame to its buffer via ‘fit-frame-to-buffer’ (*note
     Resizing Windows::).

in section 30.4.3.4 Layout Parameters of the Elisp manual.

martin