1071613 - Sometimes a CSS stylesheet is loaded twice

Status: RESOLVED DUPLICATE of bug 1306892

(DevTools :: Style Editor, defect, P3)

Description

[rckghker]

Attachment: demo.tar.bz2

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0
Build ID: 20140912222815

Steps to reproduce:

tl;dr: Iff `devtools.styleeditor.source-maps-enabled` and a CSS
selector is `*`, then the stylesheet is loaded twice.


Set up the files `twice.html`, `twice.css`, `once.css` from the
attachment to be served by a web server.  These are minimal working
examples toreproduce the bug.

In Firefox, visit `about:config`, check that
`devtools.styleeditor.source-maps-enabled: false`.

New tab.

<right-click>-[Inspect Element], select [Network].  Then
load `twice.html` from the server.

    twice.html  -loaded once
    twice.css   -loaded once

In `about:config`, check that
`devtools.styleeditor.source-maps-enabled: true`.

Reload the `twice.html` tab (happens automatically here).

    twice.html  -loaded once
    twice.css   -loaded twice <- !!!

Change `twice.html` to use `once.css` instead.  Reload the
`twice.html` tab.
    
    twice.html  -loaded once
    once.css    -loaded once









devtools.styleeditor.source-maps-enabled: true
http://stefan-klinger.de/once.css   -loaded once
http://stefan-klinger.de/twice.css   -loaded twice



Actual results:

Under the described conditions, the stylesheet was loaded twice.


Expected results:

The stylesheet should have been loaded only once.

Comment 1

[Patrick Brosset <:pbro>]

Inspector bug triage (filter on CLIMBING SHOES).

Comment 2

[Tom Tromey :tromey]

I believe this is a dup of bug 1306892.