Hi,
I have been using a hack to deal with this bug for over a year now. I believe I am seeing this problem ever since I starting understanding more and more of elisp, around emacs 24.3.
Problem:
- I save the frame width using `frame-pixel-width' to a defvar.
- I then set the frame size using `set-frame-size' with that defvar as one of the args
- I notice that the frame had got wider! When I do a readback using `frame-pixel-width', it is exactly 16 pixels wider than expected.
I have seen this problem on emacsen built earlier on RHEL 5 and now on RHEL 6 too.
Evaluate the below code in the scratch buffer in an emacs -Q session. Then when you keep on hitting F2, you will see that the frame keeps on getting wider.
Now if you uncomment the line with the "<-- HACK" comment, reeval the code and then keep on hitting F2, the frame width will stay the same (which was the end goal of the below code).
(defvar bkp--frame-height-px nil)
(defvar bkp--frame-width-px nil)
(defun modi/toggle-menu-bar ()
"Toggle the menu bar.
Also restore the original frame size when disabling the menu bar."
(interactive)
(let ((frame-resize-pixelwise t))
;; If the menu bar is hidden currently, take a backup of the frame height.
(when (null menu-bar-mode)
(setq bkp--frame-height-px (frame-pixel-height))
(setq bkp--frame-width-px (frame-pixel-width))
;; ;; `frame-pixel-width' is returning a value higher by 16 pixels compared
;; ;; to that set using `set-frame-size'. So the below adjustment has to be made.
;; (setq bkp--frame-width-px (- (frame-pixel-width) 16))) ; <-- HACK
(menu-bar-mode 'toggle)
;; Restore frame size if menu bar is hidden after toggle
(when (null menu-bar-mode)
(set-frame-size nil bkp--frame-width-px bkp--frame-height-px :pixelwise))))
(global-set-key (kbd "<f2>") #'modi/toggle-menu-bar)
-----------------------------------------------------------------------------------------------------
In GNU Emacs 25.0.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.23)
of 2015-09-14
Repository revision: 1ee47d477ddb9c567eaf63154f78fad5d5826b78
Windowing system distributor 'The X.Org Foundation', version 11.0.60900000
System Description: Red Hat Enterprise Linux Workstation release 6.6 (Santiago)
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