bug#23305: 25.0.92; Right-clicking on ERC menu bar uses wrong window

[John Wiegley]

When using ERC, I'll be in a buffer, say #emacs, with many other channels
mentioned on my mode-line, for example:

    [##h:4,#n:18,*:1]

In Emacs 24.5, if I right-click on one of these labels, it selects that buffer
*in the window whose mode-line I clicked on*.

In the Emacs 25.1 pretest, right-clicking on a labels appears to change a
random window within the buffer: neither the currently selected window, nor
the window whose mode-line I click.

-- 
John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2