1372289 - Nightly: Unclickable horizontal line across the top of some windows

Status: VERIFIED FIXED

(Firefox :: Tabbed Browser, defect, P1)

Description

[Caspy7]

I update Nightly daily and today after updating I noticed that some, but not all of my windows have a horizontal 2 pixel line across the top edge.

Tested in safe mode and the issue persisted. Another Nightly user on IRC, also on Windows 10, reported having the same thing (others did not).

The notably irritating issue here is that I keep my browser windows full screen and naturally push my mouse to the top of the screen to click on a tab, which no longer works. This has made selecting tabs a chore.

Comment 1

[Mike Conley (:mconley) (:⚙️) (Catching up on needinfos)]

Thanks for reporting, Caspy7. Do you have a screenshot you can post?

Comment 2

[Caspy7]

Attachment: Screenshot Demonstrating horizontal line

Comment 3

[Caspy7]

Attachment: Screenshot Demonstrating No line (for comparison)

Comment 4

[Mike Conley (:mconley) (:⚙️) (Catching up on needinfos)]

Thanks Caspy7. Hey Dao, is this a known regression?

Comment 5

[Caspy7]

It was pointed out earlier by Philipp that the prior changeset was pretty limited.

https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=799d43edb324395cf02da6b028e803712334615f&tochange=27cad9749cddf68e11fdd4e5d73dad84a8f8cf23

This is assuming that the malicious change didn't somehow manifest later than when it landed.

Also, I just updated to 56 and the issue is still present.

Comment 6

[Caspy7]

I just discovered that if I click and drag this line down that it acts like a maximized window titlebar (the same as the new drag square on the left) where you click and pull down and now it becomes windowed/non-maximized.

Comment 7

[Hsin-Yi Tsai (away for a while) [:hsinyi]]

Hi Dão, does this live on Nightly for now? How much do we concern this issue for 55 release?

Comment 8

[Dão Gottwald [::dao]]

Caspy7, what are your Windows DPI settings?

Comment 9

[Caspy7]

Assuming you're talking about the "Change the size of text, app, and other item" setting it's 150%.
http://i.imgur.com/AH3hBPT.png
If you're talking about layout.css.dpi, it's -1.

As a side note, I saw this marked 55 unaffected, but will point out I observed this in the last build of 55, however, I'm guessing it's photon related which would exempt non-nightly builds for now.

Comment 10

[Caspy7]

In case it's a helpful datapoint, I tried shutting down Firefox and setting zoom to 100% and restarting but this did not help. Additionally I tried doing the same but renaming xulstore.json (also to no avail).

Comment 11

[UK92]

When i set my DPI setting to 100%, this bug is present in Firefox Release too.

Comment 12

[Oriol Brufau [:Oriol]]

This happens to me when the window is created non-maximized.

1. Make current window non-maximized
2. Open a new (non-maximided) window with Ctrl+N
3. Maximize the new window, there is this problem.

But if the window is created maximized, then it works well.

Comment 13

[Oriol Brufau [:Oriol]]

Attachment: titlebar.patch

OK, the problem is that #titlebar is 32px tall but only has -31px margin-bottom.

Therefore, the tabs don't fully overlap it, 1px remains above.

This is because the code used Math.min but I think Math.max is more appropriate.

Comment 14

[Dão Gottwald [::dao]]

Comment on attachment 8878249 [details] [diff] [review]
titlebar.patch

Thanks! This seems to make sense, although I can't really test it since I can't reproduce the bug.

Comment 15

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/mozilla-inbound/rev/d4fa07225921
Remove 1px gap above tabs in maximzed windows. r=dao

Comment 16

[Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)]

https://hg.mozilla.org/mozilla-central/rev/d4fa07225921

Comment 17

[Caspy7]

I'm still seeing this on today's build, but per the landing time in comment 16, should it have been included?

Comment 18

[Oriol Brufau [:Oriol]]

(In reply to Caspy7 from comment #17)
> I'm still seeing this on today's build, but per the landing time in comment
> 16, should it have been included?

Yes, and the problem is fixed for me in nightly 56.0a1 2017-06-17 build bb8eab3c3ac4147848c4c85d628ba72029978665

Now I see comment 0 says 2px but I only had 1px. So maybe you still have something which produces that extra pixel?

Comment 19

[Oriol Brufau [:Oriol]]

Caspy7, if you still have the problem, can you set devtools.chrome.enabled=true, open the browser console (Ctrl+Shift+J) and post the result of this code:

{let {boxSizing, marginTop, borderTopWidth, paddingTop, height, paddingBottom, borderBottomWidth, marginBottom} = getComputedStyle(document.getElementById('titlebar')); JSON.stringify({boxSizing, marginTop, borderTopWidth, paddingTop, height, paddingBottom, borderBottomWidth, marginBottom, y: document.getElementById('tab-view-deck').getBoundingClientRect().y}, null, 2)}

Before my patch I got

{
  "boxSizing": "border-box",
  "marginTop": "0px",
  "borderTopWidth": "0px",
  "paddingTop": "8px",
  "height": "40px",
  "paddingBottom": "0px",
  "borderBottomWidth": "0px",
  "marginBottom": "-31px",
  "y": 9
}

And now it's

{
  "boxSizing": "border-box",
  "marginTop": "0px",
  "borderTopWidth": "0px",
  "paddingTop": "8px",
  "height": "39px",
  "paddingBottom": "0px",
  "borderBottomWidth": "0px",
  "marginBottom": "-31px",
  "y": 8
}

Comment 20

[Caspy7]

Welp, for some reason Nightly was not updating properly since Friday (the 16th). It *appeared* to update, but then things got wonky on updating till it finally linked me to the manual installer.

After an update it appears that this issue is fixed.

Comment 21

[Aravind Arul]

Operating System:Windows 10 x64
Firefox version:Nightly 52.0a.1

I have tested this bug in my latest nightly browser and it cannot be reproduced.
This Bug has been resolved and fixed.


[bugday-20170628]