1591886 - Track Changes: Add a way to revert individual changes

Status: NEW

(DevTools :: Inspector: Changes, enhancement, P3)

Description

[Razvan Caliman [:rcaliman]]

User story by :fvsch in Slack:

I was making some changes in Rules, inspecting a few elements and changes their CSS, to see if changing a element's display to display: flex and adding a few properties on its children would work to achieve my layout. When it turned out okay, I went to Changes to get a summary of my changes. But in Changes there were some useless changes from previous tests or stuff like background: pink that I didn't need. So I wanted to remove or revert some of the changes, to create a clean export of just the right changes. My first intuition was to look for a way to revert specific lines or groups of lines, like I can do in VS Code. Since that's not possible, I copied an original value, and tried to go to the right place in Rules to paste it (to undo that change), which was hard because I didn't have the right element selected.