bug#22048: 25.1; frame title vanishes when speedbar present

[David Reitter]

X-Debbugs-CC: Konrad Podczeck <konrad.podczeck@univie.ac.at>

emacs -Q   [25.1 branch build on Mac OS X, standard NS Cocoa interface]

load some file
[observe title and icon in title bar of frame.]

M-x speedbar

observe title in original frame vanish.

Now, I have tried removing d9d383 (“more flicker fixes”), as this is the source 
of another bug in relation to the title/icon bar, but that doesn’t help with 
this bug.

The original reporter, who found this problem in Aquamacs (cc’ed), says that 
it’s been present for a long time.