1530630 - CSS declarations in Rules view mistakenly shown as disabled

Status: NEW

(DevTools :: Inspector: Rules, defect, P2)

Description

[Martin Balfanz [:mbalfanz]]

Attachment: str.mp4

The rules view sometimes automatically unchecks invalid declarations. It's a bit unpredictable, but I tried to find STRs. See video attached.

STR:

• visit bugzilla.mozilla.org
• select body
• navigate the markup view, then come back to body and disable the declaration color: #404040
• refresh the page with devtools open

ER:

• all declarations should be checked

AR:

• some declarations for background-image are unchecked

Comment 1

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

I could only reproduce this once in 20 minutes... we really need to get the error from the browser console when this happens.

Comment 2

[Patrick Brosset <:pbro>]

I couldn't reproduce on Firefox 66. Then I opened 67 (nightly) and as soon as I opened the inspector those properties were unchecked, without me doing anything. There wasn't any errors in the browser console though.
And after a refresh, all was good again ... So this seems very random, but definitely a real problem.
Maybe a timing issue? I'll keep on testing.