1260146 - (twitching at startup) Box model first appear at one place, then twitches a bit to the bottom

Status: NEW

(DevTools :: Inspector, defect, P3)

Description

[arni2033]

>>>   My Info:   Win7_64, Nightly 48, 32bit, ID 20160326030430
STR:
0. Open new tab, open devtools -> Inspector, open sidebar, select "Box Model" tab
1. Open http://www.rp-online.de/ in a new selected tab. If your PC is fast, repeat Step 1 ten times.
2. Once you see some content on the page, open devtools (F12)
 [you can accidentally run into bug 1249119]

AR:  Box model first appear at one place, then twitches a bit to the bottom
ER:  Box model should stay still.

This is doable: text labels could use empty/transparent text until they are filled with real values.

Screencast:
> https://dl.dropboxusercontent.com/s/np6s1phwxd9349r/screencast%201%20-%20%28twitching%20at%20startup%29%20Breadcrumbs%20%2B%20Box%20model.webm?dl=0

Comment 1

[Patrick Brosset <:pbro>]

This happens when the data above the box-model diagram appears.
To fix this, we should reserve the space in advance, so the diagram doesn't need to go down when the position and size info appear.