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bug#9186: drag copy buffer blown away by slight mouse movements on emacs

From: Andrew Schein
Subject: bug#9186: drag copy buffer blown away by slight mouse movements on emacs 23.3.1 with GTK
Date: Wed, 27 Jul 2011 21:56:54 -0700

This bug concerns the X11 style drag copy (and middle mouse button paste) on GNU emacs 23.  I noticed this problem on systems employing GTK, and haven't had the opportunity to try other systems.

I have attached a ogv formatted video showing the problem.

Since I didn't have a working mic, here is a narration.

I open emacs using -q.  You can see the message:
This is GNU Emacs 23.3.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.20.1).
The system is Ubuntu 10.04.

I then proceed to drag over some text in the buffer.

I then left click a character moving the mouse _slightly_ downward.  The message "Mark set" appears at the bottom of the buffer.

The last action is to move the mouse pointer elsewhere in the buffer and middle click.  To my surprise the text is no-longer available.

Discussion:  some sequence of calls either leading to or because of the mark-setting is blowing away the drag copy buffer.  The "mark set" message does not seem like adequate warning or explanation for this.  Note that the mouse movement was not sufficient to replace the drag-copy buffer with any new text. Instead what was there is forgotten.  When I try to reproduce emacs-like sensitivity in firefox (used as a gmail client) the text only seems to be blown away when I moved the mouse enough to place some new text there.  Furthermore, in firefox, if I accidently slip and move the mouse while clicking the left button my drag copy buffer is not blown away as long as I move the pointer back to its original position before releasing.



Andrew I. Schein

Attachment: emacs_bug.ogv
Description: video/ogg

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