Make '>' first jump to the beginning of the branch, and only then to the first commit

[stefanhaller]

• PR Description

In longer branches there's often the need to jump to the beginning of the branch, e.g. in order to re-review all commits from the beginning. There's no easy way to do this in lazygit.

In this PR I overload the "go to bottom" key (>) to jump to the first commit of the current branch if the selection is above it, and only then jump to the very bottom. I like that we don't need to introduce a new key binding for this.

I'm not super convinced this is the best solution, but after some brief testing I like it so far. @jesseduffield Keen to hear your thoughts!

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for a27db871	✅ 30.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a27db87)	Report Missing	Report Missing	Report Missing
Head commit (636b94c)	56337	48922	86.84%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4544)	30	9	30.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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Footnotes

1. Codacy didn't receive coverage data for the commit, or there was an error processing the received data. Check your integration for errors and validate that your coverage setup is correct. ↩

[jesseduffield]

I like this, given how rarely you actually need to jump to the bottom of the commits list