1. Emacs -Q 2. Txpe `M-x gnus', select a group, open it and click on an article, so that you have vertically split windows, with the Gnus Summary buffer on top and the Gnus Article buffer on the bottom. (To get to this stage, it is irrelevant whether or not you set gnus-select-method, if not, it also suffices to open a doc-group, e.g. `G f emacs/etc/gnus-tut.txt'.)
3. Make a header line in the window of the Gnus Summary buffer, e.g. by doing `M-x ruler-mode' (other header lines will also do, e.g. `M-: (setq header-line-format default-mode-line-format)'). Then do 'C-x o' to switch to the Gnus Article buffer and then make a header line in that window. Now when you do `C-x o' to switch back to the Summary buffer you should see the following (I turned off the tool bar to make smaller pictures for this report, but I also get the same display bug when it is enabled):
4. If you leave Emacs alone for about a minute, the menu bar changes to the following:
5. If you wait about another minute, the spurious Help menu disappears, leaving the usual menu bar for gnus-summary-mode. 3'. If after step 3 you click on the Agent menu, the mouse pointer changes to the shape seen when you can drag a mode line, i.e.: ^ -+- v and both Emacs windows freeze, responding to neither mouse nor keyboard. However, you can click on the menu bar, and this unfreezes the windows and also restores the normal menu bar. If instead of clicking on the Agent menu you click on the Help menu, the menu bar changes briefly to the second picture above, then switches to its normal appearance. I have only been able to reproduce this bug using the above window configuration with Gnus Summary and Article buffers. I note that the menu bar in gnus-summary-mode has a lot of menus; maybe the bug is related to that (I couldn't find another mode with as many menus in the menu bar), though again, there's no display bug if the other window is not the Gnus Article buffer. The reason I added header lines, which is necessary to see the bug, is because I originally observed it with tabbar-mode enabled (from David Ponce's package tabbar.el), which adds a header line of buffer tabs to each window. In GNU Emacs 22.0.96.5 (i686-pc-linux-gnu, GTK+ Version 2.10.6) of 2007-03-27 on escher Windowing system distributor `The X.Org Foundation', version 11.0.70199902 configured using `configure '--with-x-toolkit=gtk'' Important settings: value of $LC_ALL: nil value of $LC_COLLATE: nil value of $LC_CTYPE: nil value of $LC_MESSAGES: nil value of $LC_MONETARY: nil value of $LC_NUMERIC: nil value of $LC_TIME: nil value of $LANG: en_US.UTF-8 locale-coding-system: utf-8 default-enable-multibyte-characters: t Major mode: Article Minor modes in effect: tooltip-mode: t tool-bar-mode: t mouse-wheel-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t unify-8859-on-encoding-mode: t utf-translate-cjk-mode: t auto-compression-mode: t line-number-mode: t Recent input: C-b C-x o C-x 1 C-x 2 C-x b C-g C-h i C-x o C-x o C-x o M-x a l l o u <tab> m <tab> o <tab> <return> C-x o C-x o C-x o C-x o C-x o C-x o C-x o C-x o <return> <f1> C-g C-x 1 <return> q <return> <return> C-x o C-x o M-: <up> <return> C-x o C-x o C-x o C-x o C-x o C-x o C-x o C-x o Q y <return> <return> M-: <up> <return> C-x o C-x o C-x o C-x o C-x o C-x o C-x o C-x o C-x o C-x o C-h v C-g C-x C-x i C-x k <return> SPC <help-echo> <help-echo> <down-mouse-1> <mouse-1> <help-echo> <down-mouse-1> <mouse-movement> <mouse-1> <help-echo> <down-mouse-1> <mouse-1> <help-echo> <down-mouse-1> <mouse-1> <help-echo> <down-mouse-1> <mouse-1> C-h v m o u <tab> a u <tab> <return> <help-echo> <down-mouse-5> <mouse-5> <help-echo> <down-mouse-1> <mouse-2> <help-echo> <help-echo> <down-mouse-1> <help-echo> <help-echo> <help-echo> <help-echo> <down-mouse-1> <mouse-1> <help-echo> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <down-mouse-1> <mouse-1> h <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> Q y <return> <return> <help-echo> <select-window> <select-window> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> C-x 1 C-x C-g C-h i C-x b <return> h <help-echo> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <help-echo> <select-window> <select-window> <select-window> <select-window> <help-echo> C-x o C-x o C-x o C-x o <help-echo> <select-window> <select-window> <select-window> <help-echo> <down-mouse-1> <mouse-1> M-x r e p o r <tab> <return> Recent messages: To install your edits, invoke [State] and choose the Set operation Auto-saving...done Discard changes to this group and exit? (y or n) No more unread newsgroups Retrieving newsgroup: nndoc+gnus-help:gnus-help... Opening nndoc server on gnus-help...done Fetching headers for nndoc+gnus-help:gnus-help...done Generating summary...done Auto-saving...done Loading emacsbug...done
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