randomly enter drag & drop mode

Bug #1504522 reported by Zhang Weiwu
This bug affects 1 person
Affects Status Importance Assigned to Milestone
GMail WebApp

Bug Description


1. Start gmail app and use it for a while (about 5 seconds).
2. It will enter 'drag and drop mode' where:
- moving mouse over result half of the screen selected - the half from upper-left cornor to the mouse pointer.
- clicking no longer have effect on buttons, mail messages or anything.
- clicking an email message would attach the email subject text attach to the mouse pointer and move around the mouse pointer, as if you can drop it somewhere, but no clicking will release the email.

Once webapp enteres "drag & drop" mode, there is no other way to restore it unless closing the webapp and restart.

This can be reliabily reproduced, every time when I use gmail app, and often when I use google-calendar webapp, in typical webapp-container. In fact, it is such a show-stopper, that the fact I didn't find others reporting the problem hints this issue being local to my computer. But I did a full re-install of 15.04 and the problem remains, and that I have no such a problem on chromium-browser on the same host.

To avoid confusion I disabled every other pointer device than a USB mouse (using xinput --disable) before reproducing the bug. The same mouse is working fine across different computers, and this issue can be reproduced by using other standalone USB mice.

Zhang Weiwu (zhangweiwu)
description: updated
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