1095812 - Phantom trusted keyboard events with incorrect timeStamp

Status: RESOLVED WORKSFORME

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[Ruvim Pinka]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0
Build ID: 20141027150301

Steps to reproduce:

Scrolling a page using touch-pad with double-finger (namely on inoreader.com website), without touching a keyboard.


Actual results:

From time to time a phantom keyboard event occurs, usually ArrowLeft or ArrowRight key. In all these cases event.isTrusted is true, and event.timeStamp is exactly "10".



Expected results:

Trusted keyboard events should not be generated without key pressing.

Comment 1

[Ruvim Pinka]

Attachment: Greasemonkey userscript to prevent and logging the phantom events

The attached user script demonstrates that the issue is not related to any specific website.

Comment 2

[Ruvim Pinka]

(In reply to comment #1)
Using this userscript, I noticed that Back/Forward touchpad gestures produce the messages in log like the following:

10:02:15.173 "bug, keydown (code, key, timestamp, trusted): 18,Alt,10,true"
10:02:15.182 "bug, keydown (code, key, timestamp, trusted): 37,Left,10,true"
10:02:16.278 "bug, keydown (code, key, timestamp, trusted): 18,Alt,10,true"
10:02:16.288 "bug, keydown (code, key, timestamp, trusted): 39,Right,10,true"

For Back/Forward navigation the three-finger swipe left/right gesture is used. Apparently, the installed ASUS Elantech Touchpad driver (version 10.5.9.0) simulates these keyboard events.

And certainly the bug is that this driver occasionally generates the Left/Right keyboard events while scrolling using two-finger swipe gesture.

The alternative ASUS Smart Gesture driver (version 2.2.14) doesn't have this bug. Unfortunately, Back/Forward navigation gestures of this driver don't work in Firefox, see Bug#905386. Moreover, scroll gesture works inconsistency in this driver.

So, I suggest to use certain userscript to prevent buggy keyboard events as temporary workaround.

Comment 3

[Ruvim Pinka]

Just for reference: Elantech Touchpad driver version 11.5.15.5 generates far more phantom keyboard events in Firefox, although with correct time stamp now — so, it is harder to filter them out. Moreover, its helper application doesn't work  without administrative privileges.