[ISL] Add revert option in inline change view

[nicktogo]

inline change view feature in vscode: https://code.visualstudio.com/updates/v1_18#_inline-change-review
Sapling/ISL doesn't have revert option in this view.

[alex-statsig]

Interestingly you can right click the changed lines and click "Revert this change". I'm not sure why the other revert button doesn't show up / what setting can be enabled to make that work (tried looking into this in the past myself)

[nicktogo]

Interestingly you can right click the changed lines and click "Revert this change". I'm not sure why the other revert button doesn't show up / what setting can be enabled to make that work (tried looking into this in the past myself)

sometime line level "Revert this change" shows up, sometime it doesn't for me. Are there some tips on how to revert lines/code block easily in using sl or ISL?