1286545 - [Mac] Window dragging and tab dragging are overlapping for a narrow area in tabbar

Status: NEW

(Firefox :: Tabbed Browser, defect, P3)

Description

[Iulia Cristescu, QA [:JuliaC] (away, please needinfo? [e-mail])]

[Note]:
- It seems that this issue affects only latest Nightly 

[Affected versions]:
- latest Nightly 50.0a1 (2016-07-13)

[Affected platforms]:
- Mac OS X 10.11
- Mac OS X 10.10.5

[Steps to reproduce]:
1. Launch Firefox
2. Open several tabs
3. Choose one tab, place the cursor to its top border area and drag it horizontally

[Expected result]:
- Either the tab or the window is dragged

[Actual result]:
- Both the tab and the window are dragged (See the screencast https://drive.google.com/file/d/0B0nYKG6PRiCcVFdNMEh2a21NVnc/view?usp=sharing). The tab dragging is jerky and imprecise 

[Regression range]:
- This is a regression
* Last good revision: d2c01d77b9d0 (2014-09-17)
* First bad revision: 426497473505 (2014-09-18)
* Pushlog:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=d2c01d77b9d0&tochange=426497473505

Comment 1

[:Gijs (he/him)]

(In reply to Iulia Cristescu, QA [:IuliaC] from comment #0)
> [Note]:
> - It seems that this issue affects only latest Nightly 

...

> [Regression range]:
> - This is a regression
> * Last good revision: d2c01d77b9d0 (2014-09-17)
> * First bad revision: 426497473505 (2014-09-18)
> * Pushlog:
> https://hg.mozilla.org/mozilla-central/
> pushloghtml?fromchange=d2c01d77b9d0&tochange=426497473505

Sorry, can you elaborate? How does it both affect only latest nightly and is the regression range almost 2 years ago? Are you saying this doesn't happen on beta, or on aurora if you disable the developer edition theme, or something?

Comment 2

[Iulia Cristescu, QA [:JuliaC] (away, please needinfo? [e-mail])]

(In reply to :Gijs Kruitbosch from comment #1)
> (In reply to Iulia Cristescu, QA [:IuliaC] from comment #0)
> > [Note]:
> > - It seems that this issue affects only latest Nightly 
> 
> ...
> 
> > [Regression range]:
> > - This is a regression
> > * Last good revision: d2c01d77b9d0 (2014-09-17)
> > * First bad revision: 426497473505 (2014-09-18)
> > * Pushlog:
> > https://hg.mozilla.org/mozilla-central/
> > pushloghtml?fromchange=d2c01d77b9d0&tochange=426497473505
> 
> Sorry, can you elaborate? How does it both affect only latest nightly and is
> the regression range almost 2 years ago? Are you saying this doesn't happen
> on beta, or on aurora if you disable the developer edition theme, or
> something?

Sorry, my mistake! I made a confusion with another investigated issue. Yes, indeed, this bug also affects 
- latest Aurora 49.0a2 (2016-07-13)
- 48.0b7 build1 (20160711002726)
- 47.0.1 build1 (20160623154057)

Comment 3

[:Gijs (he/him)]

(In reply to Iulia Cristescu, QA [:IuliaC] from comment #2)
> (In reply to :Gijs Kruitbosch from comment #1)
> > (In reply to Iulia Cristescu, QA [:IuliaC] from comment #0)
> > > [Note]:
> > > - It seems that this issue affects only latest Nightly 
> > 
> > ...
> > 
> > > [Regression range]:
> > > - This is a regression
> > > * Last good revision: d2c01d77b9d0 (2014-09-17)
> > > * First bad revision: 426497473505 (2014-09-18)
> > > * Pushlog:
> > > https://hg.mozilla.org/mozilla-central/
> > > pushloghtml?fromchange=d2c01d77b9d0&tochange=426497473505
> > 
> > Sorry, can you elaborate? How does it both affect only latest nightly and is
> > the regression range almost 2 years ago? Are you saying this doesn't happen
> > on beta, or on aurora if you disable the developer edition theme, or
> > something?
> 
> Sorry, my mistake! I made a confusion with another investigated issue. Yes,
> indeed, this bug also affects 
> - latest Aurora 49.0a2 (2016-07-13)
> - 48.0b7 build1 (20160711002726)
> - 47.0.1 build1 (20160623154057)

How can it affect 47 when there's a 5px dead space at the top of the tab? On a 48 build before bug 1249818 I can't reproduce this at all. Can you clarify how you're reproducing on 47? Are you selecting background tabs or foreground tabs? Is this a lodpi or hidpi mac? Does it matter?

Comment 4

[Iulia Cristescu, QA [:JuliaC] (away, please needinfo? [e-mail])]

(In reply to :Gijs Kruitbosch from comment #3)

> How can it affect 47 when there's a 5px dead space at the top of the tab? 
> On a 48 build before bug 1249818 I can't reproduce this at all.
> Are you selecting background tabs or foreground tabs?

In the case of builds with a 5px dead space (e.g. Fx 47 or Fx 48 before bug 1249818), I selected a foreground tab (see the screencast https://drive.google.com/file/d/0B0nYKG6PRiCcbUtVak0zTEt1bDQ/view - at 00:28 is visible the selected area)

 
> Is this a lodpi or hidpi mac? Does it matter?

The station I've used is a lodpi one: iMac (21.5-inch, Late 2013), 21,5-inch (1920 x 1080) display, Intel Iris Pro 1536 MB graphics. Also, I managed to reproduce the issue on a hidpi Mac (Retina, 13-inch 2560 x 1600, Early 2015, Intel Iris Graphics 6100 1536 MB) - this means the resolution does not matter.

Comment 5

[Sylvestre Ledru [:Sylvestre]]

Moving to p3 because no activity for at least 1 year(s).
See https://github.com/mozilla/bug-handling/blob/master/policy/triage-bugzilla.md#how-do-you-triage for more information