1184994 - Characters in URL bar are cut-off

Status: RESOLVED INACTIVE

(Firefox :: Address Bar, defect)

Description

[Valentin Gosu [:valentin] (he/him)]

Attachment: url_bar_1.png

During the past week I've noticed characters in the URL bar are sometimes cut off, usually by a couple of pixels. This started happening around the same time the new tracking-protection & permissions dropdown was introduced.

From what I can see, it usually cuts off part of the first character in either the scheme, domain name, or even the green cert on bugzilla. See attachments.

- I'm using Gnome-Ubuntu with Firefox Nightly 42.0a1 (2015-07-16)

Comment 1

[Valentin Gosu [:valentin] (he/him)]

Attachment: url_bar_2.png

Comment 2

[Valentin Gosu [:valentin] (he/him)]

Attachment: url_bar_3.png

Comment 3

[Tim Taubert [:ttaubert] (inactive)]

Is this reproducible? This this always happen for some URLs?

Comment 4

[Valentin Gosu [:valentin] (he/him)]

Yes, it always happens, and I've just discovered the reason. I have a high res screen, so I set the layout.css.devPixelsPerPx pref to 1.5
Resetting it seems to fix it, but I would still rather it worked.

Comment 5

[Tim Taubert [:ttaubert] (inactive)]

Adding Paolo, he has done a lot of work on the identity box lately.

Comment 6

[:Paolo Amadini]

We're using regular margin and padding properties there, although in some cases I've seen in the code that we use values that are a bit off by a small fractional values, to work around bugs.

This, and the fact it happens in the middle of the text too, makes me think this problem might be a font layout bug. To verify whether it's a regression from the identity block changes or not, can you try this with a build made right before and right after bug 1180202 landed?

Comment 7

[Valentin Gosu [:valentin] (he/him)]

(In reply to :Paolo Amadini from comment #6)
> We're using regular margin and padding properties there, although in some
> cases I've seen in the code that we use values that are a bit off by a small
> fractional values, to work around bugs.
> 
> This, and the fact it happens in the middle of the text too, makes me think
> this problem might be a font layout bug. To verify whether it's a regression
> from the identity block changes or not, can you try this with a build made
> right before and right after bug 1180202 landed?

That seems to be the exact point when this bug started occuring (the fx-team merge to mc)
I don't see the bug in rev c9f187c55060 [1] but I do in rev 7ec3e4b2a45f [2]

[1] http://ftp.mozilla.org/pub/mozilla.org/firefox/tinderbox-builds/mozilla-central-linux64/1436484218/
[2] http://ftp.mozilla.org/pub/mozilla.org/firefox/tinderbox-builds/mozilla-central-linux64/1436484279/

Thanks!

Comment 8

[Peter F. Patel-Schneider]

Attachment: Screenshot of URL area showing cut-off characters

I have a very similar issue, with characters cut off at the bottom in the URL area.  Is this likely to be the same problem, or should I file a new ticket?

Comment 9

[BMO Automation]

Per policy at https://wiki.mozilla.org/Bug_Triage/Projects/Bug_Handling/Bug_Husbandry#Inactive_Bugs. If this bug is not an enhancement request or a bug not present in a supported release of Firefox, then it may be reopened.