Mike Hoye [:mhoye] Reporter
	Description • 9 years ago

While scrolling (in particular on Metafilter, but lots of places) the text will periodically double in vertical size during the scrolling before snapping back to regular text after a brief pause. 

This doesn't occur on all sites, but the ones on which it does occur, it occurs consistently.

I can reproduce this at will, on current OSX and current Nightly, with no zoom.

I've left it as normal severity, but the effect is really hideous, seriously.

	Mike Hoye [:mhoye] Reporter
	Comment 1 • 9 years ago

This is with E10S activated.

	Kartikaya Gupta (email:kats@mozilla.staktrace.com)
	Comment 2 • 9 years ago

Can you please provide a specific URL you're seeing this on?

	Botond Ballo [:botond]
	Comment 3 • 9 years ago

Mike, could you also say whether disabling the pref 'layers.async-pan-zoom.enabled' makes the problem go away?

	Mike Hoye [:mhoye] Reporter
	Comment 4 • 9 years ago

Metafilter.com

	Mike Hoye [:mhoye] Reporter
	Comment 5 • 9 years ago

On its own, no, but disabling it and restarting the browser does.

	Botond Ballo [:botond]
	Comment 6 • 9 years ago

Yeah, sorry, I should've mentioned that pref requires a restart to take effect. Thanks for testing!

I can't repro the problem on Linux with APZ enabled, so it might be something Mac-specific.

	Kartikaya Gupta (email:kats@mozilla.staktrace.com)
	Comment 7 • 9 years ago

I'm not able to reproduce the issue on my OS X nightly build on metafilter.com. There are probably more factors involved here (and therefore it may not be Mac-specific).

	James Willcox (:snorp) (jwillcox@mozilla.com) (he/him)
	Comment 8 • 9 years ago

I can reproduce this too, but it only seems to happen if I'm on the integrated Intel GPU.

	Brad Lassey [:blassey] (use needinfo?)
	Comment 9 • 9 years ago

I have seen this while scrolling hotel.com's results page and when loading an etherpad.

	Kartikaya Gupta (email:kats@mozilla.staktrace.com)
	Comment 10 • 9 years ago

CC'ing nical and dvander as this is most likely a problem somewhere in the gfx layers/tiling code, considering comment 8.

	Markus Stange [:mstange] Assignee
	Comment 13 • 9 years ago

This happens because we try to create an untiled layer larger than the maximum texture size.

	Markus Stange [:mstange] Assignee
	Comment 14 • 9 years ago

Bug 1195400 - Don't use SingleTiledContentClient for layers that are larger than the maximum texture size. r?mattwoodrow

	Markus Stange [:mstange] Assignee
	Comment 15 • 9 years ago

Bug 1195400 - Check ancestor geometry roots when determining scrollability of a layer. r?mattwoodrow

	Matt Woodrow (:mattwoodrow)
	Comment 16 • 9 years ago

Comment on attachment 8663426 [details]
MozReview Request: Bug 1195400 - Don't use SingleTiledContentClient for layers that are larger than the maximum texture size. r?mattwoodrow

https://reviewboard.mozilla.org/r/19797/#review17847

::: python/mozbuild/mozbuild/base.py:601
(Diff revision 1)
> +            # print "validating make:", make

I assume this isn't meant to be part of the patch

	Matt Woodrow (:mattwoodrow)
	Comment 17 • 9 years ago

Comment on attachment 8663427 [details]
MozReview Request: Bug 1195400 - Check ancestor geometry roots when determining scrollability of a layer. r?mattwoodrow

https://reviewboard.mozilla.org/r/19799/#review17849

	Pulsebot
	Comment 18 • 9 years ago

https://hg.mozilla.org/integration/mozilla-inbound/rev/17a4283a8b6f
https://hg.mozilla.org/integration/mozilla-inbound/rev/0a34ebc90b12

	Pulsebot
	Comment 19 • 9 years ago

Backout:
https://hg.mozilla.org/integration/mozilla-inbound/rev/69881ac19fc0

	Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)
	Comment 20 • 9 years ago

https://hg.mozilla.org/mozilla-central/rev/0a34ebc90b12

	u279076
	Comment 21 • 9 years ago

Mike, could you please verify this is fixed in the next Nightly build?

	Mike Hoye [:mhoye] Reporter
	Comment 22 • 9 years ago

I'm on 44.0a1 (2015-09-23) and I can't reproduce this anymore. Thanks!

	Mike Hoye [:mhoye] Reporter
	Comment 24 • 9 years ago

As of current nightly I have started seeing this behavior again on this page:

https://medium.com/working-parents-in-america/beyond-doing-half-the-parenting-d92996d7a106 

Should this be reopened, or a new bug?

	Markus Stange [:mstange] Assignee
	Comment 25 • 9 years ago

Eek! New bug, please.

	Mike Hoye [:mhoye] Reporter
	Comment 26 • 9 years ago

bug 1210418 filed, thanks.