Highlight commits/branch lines of when selecting a merge commit

[themilkman]

Problem description

I am often reviewing merge commits (and do not necessarily have those checked out).
It'd be helpful to have a visual indicator to see which commits are in the history of the currently selected merge commit would help to distinguish them from others on not yet merged branches.
Hiding all other branches is a possible workaround, but not very comfortable.

Preferred solution

When clicking on a merge commit, add a visualization.
A visual indicator could be (in the commit section):

• coloring the branch lines starting from the merge commit (maybe until the root or until the initial commit).
• changing the background color of all parent commits slightly
• a colored, thicker border on the right side of a commit "row" (to the right of the commit time). Of course without always re-aligning/moving the time text

That'd allow to read the commit messages and the eyes wouldn't have to look on which branch the commit is by scanning the branch lines and search the commit dot while remembering which color the branches had that you are following.

Alternatives

This could also be the default, not only when clicking a merge commit but for all commits. Always show "this commit is a in the history of the selected commit".