[Enhancement] Add new graph-highlighting option "Selected Commits (only first-parent)" - #2646
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[Enhancement] Add new graph-highlighting option "Selected Commits (only first-parent)"#2646goran-w wants to merge 5 commits into
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* The remaining parents are covered further down (under condition '!firstParentOnlyEnabled'). * This is made in prep for upcoming work on adding a new highlighting option.
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This PR does some refactoring of the graph-highlighting code and adds a new highlighting-option variant "Selected Commits (only first-parent)".
The new highlighting-option is similar to the existing highlighting-option "Selected Commits Only", but restricted to only ever highlighting the first-parent when going backwards in history from the selected commit(s). This feature was first discussed in comments on a related issue here.
I find it very helpful to restrict the highlighting to first-parent, while still drawing the other parents. I've implemented it in the easiest way I could find, which was to only apply it to "selected commits" in a new option variant. (It would be possible, but a bit more involved, to instead implement it as a separate "perpendicular" option that could be applied to the "All" and "Current branch" variants as well...)
NOTE: This new highlighting-option is somewhat related to the Git-option
--first-parent(which is applied by SourceGit's show-flag "First-parent only"), but it's not the same! The new option only restricts the highlighting of non-first-parents, while the existing show-flag hides them entirely. (Also, the option and flag can be used simultaneously without issues.)