1264402 - [e10s] Dragging tab from one window to another on different displays doesn't always load

Status: RESOLVED DUPLICATE of bug 1267844

(Firefox :: Tabbed Browser, defect, P4)

Description

[Mark Côté [:mcote]]

This behaviour started in Nightly for me a few days ago.  When I drag a tab from the window on my built-in (MBP Retina) display to a window in an external monitor, I get the loading icon forever.  This does not happen (i.e. it works fine) if I drag from the same windows if they are both on the same display.  It also appears to work fine if I drag a tab from the built-in display to the external monitor as a new window.  Interestingly, dragging more tabs to that same new window works, but it continues to not work on my old window.

Comment 1

[Mike Conley (:mconley) (:⚙️)]

Spoke to mcote - what he's referring to by "loading icon" is the async tab switch spinner.

Comment 2

[Mark Côté [:mcote]]

Actually, it seems that dragging a tab from one window to another even on the same display doesn't usually work.

Comment 3

[Mike Conley (:mconley) (:⚙️)]

Would you mind pasting your about:support?

Comment 4

[Mark Côté [:mcote]]

Application Basics
------------------

Name: Firefox
Version: 48.0a1
Build ID: 20160413030239
Update Channel: nightly
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:48.0) Gecko/20100101 Firefox/48.0
OS: Darwin 15.4.0 x86-64
Multiprocess Windows: 3/3 (Enabled by user)
Safe Mode: false

Crash Reports for the Last 3 Days
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All Crash Reports (including 2 pending crashes in the given time range)

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Comment 5

[:Gijs (he/him)]

Any chance you can use mozregression to find out what broke this? Something like:

./mach mozregression --good 2016-04-08 --profile path/to/your/regular/nightly/profile

should take < 5 minutes to narrow down, and would help a lot, especially if this is related to your profile at all.

Comment 6

[Mark Côté [:mcote]]

Took a bit longer than five minutes :) but mozregression identified the offender as being bug 1254865.  This assumes everything was reliably reproducing.  I did notice that sometimes it would take an extra drag (back to the built-in screen) to exhibit the problem, so I made sure to do multiple drags on the good builds.

Hope this helps.

Comment 7

[Mike Conley (:mconley) (:⚙️)]

Thanks for the work, mcote. We'll have this triaged tomorrow.

Comment 8

[Tracy Walker [:tracy]]

This works for me on Mac 10.12, Nightly 48.0a1, 20160419030312.  The Unique Tabs add-on looked like a suspect.  But I installed it and still could not reproduce this bug. 

mcote, when you have a chance, please try in a clean profile.

Comment 9

[Mark Côté [:mcote]]

Hm yeah, works fine with a new profile.

I just removed a bunch of add-ons from my main profile, including Unique Tabs, and, although they were all disabled, the problem seems to have gone away!

Comment 10

[Jim Mathies [:jimm]]

Mark, can you keep an eye on this and renom if you run into again. We're guessing this is caused by the tabs addons, but we're not 100% sure. For now we're not going to block on this.

Comment 11

[Mark Côté [:mcote]]

I spoke too soon.  The problem just manifested again (with my original profile and a bunch of add-ons removed).

Comment 12

[Mike Conley (:mconley) (:⚙️)]

Is it possible for someone from the QA team to try to reproduce Mark's bug here? I'm having no luck.

Comment 14

[Tracy Walker [:tracy]]

Arni, if you have STR's that reliably reproduce the result, by all means, post them here in this bug.

Comment 15

[Paul Pasca[Away. Please needinfo? Paul Oiegas [:pauloiegasSV]]]

Hi Mark,

I have tested your issue on latest FF release (45.0.2) and latest Nightly build and could not reproduce it. I have dragged and dropped a tab from one window to another(located on a secondary monitor) and I didn't have any loading issues. I've tested this on a Mac Book Pro Retina with OS X 10.12.2 installed. I wasn't able to reproduce this regardless if I've dragged the tab from the retina display on the secondary monitor, nor if I've dragged the tab from the second monitor to the retina display.

Is this still reproducible on your end ? If yes, can you please retest this using latest FF release and latest Nightly build (https://nightly.mozilla.org/) and report back the results ? When doing this, please use a new clean Firefox profile, maybe even safe mode, to eliminate custom settings as a possible cause (https://goo.gl/PNe90E).

Thanks,
Paul.

Comment 16

[Mark Côté [:mcote]]

Hi, as I mentioned in comment 9, this does not happen with a clean profile.  It is still reproducible with my current profile on today's Nightly.  It was not reproducible in release.

Comment 17

[Mark Côté [:mcote]]

Although all my add-ons were disabled, I just removed them all and restarted.  So far the problem hasn't reproduced, but as I found before, sometimes it just takes a while.  I'll comment if I see it again.

Comment 18

[Mark Côté [:mcote]]

Aaand just reproduced it.

Comment 19

[Paul Pasca[Away. Please needinfo? Paul Oiegas [:pauloiegasSV]]]

Hi Mark,

Since this issue is not reproducible on a new profile, it seems to be related to custom settings you made on your profile. Is it safe to close this bug as RESOLVED WFM?

Thanks,
Paul.

Comment 20

[Mark Côté [:mcote]]

See bug 1267844, where it looks like we have a reproducible test case.  Up to you if you want to resolve that one or this one.

Comment 21

[Mike Conley (:mconley) (:⚙️)]

Thanks mcote!