982822 - Box Model updates its values with a multi-second delay

Status: RESOLVED WORKSFORME

(DevTools :: Inspector, defect, P2)

Description

[Anton Kovalyov (:anton)]

When switching between elements our Box Model sidebar updates with a pretty significant delay. I noticed delays ranging from half a second to 4-5 seconds. Initially I thought that it isn't updating at all but it seems like it just takes a long time. When you switch from Box Model to any other sidebar tab and then back, it updates immediately.

STR:

 1. Open medium.com (thats where I can reproduce it consistently)
 2. Inspect header
 3. Open box model sidebar
 4. Switch between elements in the element tree.

Then you should notice delays.

Comment 1

[Brian Grinstead [:bgrins]]

I can confirm this is an issue

Comment 2

[Tim Nguyen :ntim]

I think it's a regression of the "Make highlighter remote" bug. I started to get the issue at that time.

Comment 3

[Mike Ratcliffe [:miker] [:mratcliffe] [:mikeratcliffe]]

We need to make the layout view only update on layout change... we have access to this from an actor.

At the moment we are using MozAfterPaint on browser which makes the layout view update way too many times... moving the mouse is moved across the browser will refresh it hundreds of times.

Comment 4

[Jay]

I may have filed a duplicate of this bug at #999712.

In my case, when there is a delay in the Box Model diagram being updated, what causes it to finally update is moving the mouse cursor into the Box Model pane.

Comment 5

[George Crary]

I've been unable to reproduce this bug as well as the listed duplicate bug #982822.

Tested in Firefox 46.0a2
Build ID: 20160204004009
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:46.0) Gecko/20100101 Firefox/46.0

Comment 6

[Brian Grinstead [:bgrins]]

(In reply to George Crary from comment #5)
> I've been unable to reproduce this bug as well as the listed duplicate bug
> #982822.
> 
> Tested in Firefox 46.0a2
> Build ID: 20160204004009
> User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:46.0)
> Gecko/20100101 Firefox/46.0

Mike, can you confirm this problem has gone away?

Comment 7

[Mike Ratcliffe [:miker] [:mratcliffe] [:mikeratcliffe]]

Yes, this was fixed as part of switching to the reflow actor in bug 997198.