1035114 - Delayed screen updates when scrolling inside textarea nodes or dropdowns

Status: RESOLVED FIXED

(Core :: Graphics: Layers, defect)

Description

[Henrik Skupin (:whimboo) [⌚️UTC+1]]

First seen with Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0 ID:20140706004001 CSet: f53099796238 but tracked back until 27.0b1 so far. 

When I vertically scroll inside some textarea elements, parts of the screen are not updated immediately but it takes about 2-4s. 

Steps:
1. Open https://wiki.mozilla.org/index.php?title=QA/Automation/Meetings&action=edit&section=4 and ensure you are logged in, so you can edit the textarea
2. Scroll vertically in that textarea element

With step 2 you will notice that parts are not updated immediately. It takes some seconds.

This may be dependent on the graphic card, or drivers. In my case I have a Lenovo Thinkpad X230. Graphics card details see below: 

Adapter Description	Intel Open Source Technology Center -- Mesa DRI Intel(R) Ivybridge Mobile
Device ID	Mesa DRI Intel(R) Ivybridge Mobile
Driver Version	3.0 Mesa 10.1.3
GPU Accelerated Windows	0/2 Basic
Vendor ID	Intel Open Source Technology Center
WebGL Renderer	Intel Open Source Technology Center -- Mesa DRI Intel(R) Ivybridge Mobile
windowLayerManagerRemote	false
AzureCanvasBackend	cairo
AzureContentBackend	cairo
AzureFallbackCanvasBackend	none
AzureSkiaAccelerated	0

Comment 1

[Henrik Skupin (:whimboo) [⌚️UTC+1]]

Hm, just tested with latest nightly and it works. Quick test shows that it was fixed on mozilla-central between 06/30 and 07/01:

https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=b6408c32a170&tochange=83c09fe3a658

Daniel, could you check for the range on inbound builds? That would help me a lot. Thanks.

Comment 2

[Daniel Gherasim]

Here is the regression range from inbound:
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=0303b2fe5f90&tochange=f79302ac0ede

I'm not sure in which bug from those 3 this gets fixed.

Comment 3

[Henrik Skupin (:whimboo) [⌚️UTC+1]]

Well, this is nothing related to fonts. So bug 1028237 should have fixed that. Matt, would that make sense?

Given that bug 1028237 has a different regression range and regressor, I would like to keep this bug separate. It's not related to video controls, and has started with Firefox 27.0b1.

Comment 4

[Henrik Skupin (:whimboo) [⌚️UTC+1]]

This is a very annoying behavior and makes it very hard to interact with certain elements. I see the same when scrolling through the branch list of Github hosted repositories:

https://github.com/mozilla/qa-mozmill-tests/tree/mozilla-aurora

Just click the branch dropdown and scroll down. Large parts stay white.

Comment 5

[Henrik Skupin (:whimboo) [⌚️UTC+1]]

Attachment: screenshot (textarea)

Comment 6

[Henrik Skupin (:whimboo) [⌚️UTC+1]]

Attachment: screenshot (dropdown)

Comment 7

[Sylvestre Ledru [:Sylvestre]]

Yeh, running GNU/Linux too, I had this issue at a few occasions. However, I cannot reproduce your testcase.
We have this bug for a while. Not sure we will block the 31 release for that.
We can always take a patch if it is minor and very low risk.
Tracking for 32.

Comment 8

[Henrik Skupin (:whimboo) [⌚️UTC+1]]

(In reply to Sylvestre Ledru [:sylvestre] from comment #7)
> We can always take a patch if it is minor and very low risk.
> Tracking for 32.

The patch on bug 1028237 should fix it, given that I cannot see the problem with Firefox 33.0 anymore. So we should put more eyes on getting the patch backported.

Comment 9

[Sylvestre Ledru [:Sylvestre]]

OK. So, let's move this discussion in bug 1028237.

Comment 10

[u279076]

(In reply to Sylvestre Ledru [:sylvestre] from comment #9)
> OK. So, let's move this discussion in bug 1028237.

So should this bug be duped?

Comment 11

[Henrik Skupin (:whimboo) [⌚️UTC+1]]

This bug depends on that fix but was caused by another patch way earlier. So I don't think so, as already mentioned above.

I haven't seen the needs to check for the regression range given that a fix is already in place. If you want that please let us know.

Comment 12

[Henrik Skupin (:whimboo) [⌚️UTC+1]]

Works great now with Aurora too: Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0 ID:20140715004003 CSet: d32649a24965