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bug#11738: 24.1.50; Regression: `modify-frame-parameters' is broken for

From: Drew Adams
Subject: bug#11738: 24.1.50; Regression: `modify-frame-parameters' is broken for `left' & `top'
Date: Mon, 18 Jun 2012 19:33:19 -0700

Note: It still works fine in the release (24.1), but is broken in this
emacs -Q
In *scratch*:
(setq new (- (frame-parameter nil 'left) 10))
(setq new `(left + ,new))
(modify-frame-parameters nil (list new))
IOW, try to set `left' or `top' to a value that is a cons whose car is
`left' or `top', whose cadr is `+' or `-', and whose caddr is some new
value.  Nothing happens.

This is a regression wrt ALL previous Emacs versions (well, ever
since we had frames).  It is important that the cons form of these
parameter values continue to be accepted, as it has always been.

See also this, which brought the bug to my attention:

In GNU Emacs (i386-mingw-nt5.1.2600)
 of 2012-06-18 on MARVIN
Bzr revision: 108646 address@hidden
Windowing system distributor `Microsoft Corp.', version 5.1.2600
Configured using:
 `configure --with-gcc (4.6) --no-opt --enable-checking --cflags

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