Subject: 24.4.50; `windmove-do-window-select: change `error' to `user-error'

From: Drew Adams <[email-masked]>
Date: Tue, 12 Aug 2014 20:34:13 -0700 (PDT)

Subject line says it all.  If `debug-on-error' is non-nil there is no
reason to enter the debugger here.

(An alternative could be to not raise an error and just make this a no-op
or a `ding'.)

In GNU Emacs 24.4.50.1 (i686-pc-mingw32)
 of 2014-06-28 on ODIEONE
Bzr revision: 117431 [email-masked]
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --prefix=/c/Devel/emacs/snapshot/trunk
 --enable-checking=yes,glyphs 'CFLAGS=-O0 -g3'
 LDFLAGS=-Lc:/Devel/emacs/lib 'CPPFLAGS=-DGC_MCHECK=1
 -Ic:/Devel/emacs/include''