bug#22105: 25.1.50; REGRESSION - `modify-frame-parameters'

[martin rudalics <rudalics@gmx.at>]

 > Here is perhaps a clue to the problem: Variable `thumfr-frame-parameters'
 > has value ((menu-bar-lines . 0)).  If you comment-out that line, to
 > give it a value of (()), then there is no bug.  You can also uncomment
 > the commented-out lines, to give it a value of, say,
 > ((tool-bar-lines . 0) (scroll-bar-width . 6) (scroll-bar-height . 6)),
 > and then there is no bug either.  It seems that it is the presence of
 > the `menu-bar-lines' sexp that is problematic.

I suppose the behavior is indeed caused by adding and removing the menu
bar.  At least when doing C-z repeatedly with the "(debug)" commented
out I see here both small and normal font frames continuously increase
in size.

You could try with

(setq frame-inhibit-implied-resize '(menu-bar-lines tool-bar-lines))

which inherently means to not resize the outer frame when adding or
removing the menu bar.  It seems to cure the problem I described above.

martin