bug#70894: [PATCH] * lisp/window.el (fit-window-to-buffer): Fix width calculation

[martin rudalics via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

 > Martin, any comments?

Looks good to me.  Principally, instead of subtracting the sizes of the
decorations from the initial total width and re-adding them later, they
should have been added to the calculated pixel width as is done when
fitting the height.

But mildly spoken, 'fit-window-to-buffer' is a complete mess in the
first place.  Calculating sizes in terms of lines/columns doesn't make
sense.  If really necessary - minibuffer resizing, for example, does not
care - results should be rounded in a final step.  Also, I doubt that
both char-width and char-height are calculated reasonably when buffer
text is scaled or line spacing changed.

martin