[Tests] Log popup coverage

This issue is to track our test coverage for the log popup.

Commit Limiting

• =n Limit number of commits (--max-count=256)
• =A Limit to author (--author=)
• =F Search messages (--grep=)
• =s Limit to commits since (--since=)
• =u Limit to commits until (--until=)
• -G Search changes (-G)
• -S Search occurrences (-S)
• -L Trace line evolution (-L)
• =m Omit merges (--no-merges)
• =p First parent (--first-parent)
• =R List reflog (--reflog)

History Simplification

• -D Simplify by decoration (--simplify-by-decoration)
• -- Limit to files (--)
• -f Follow renames when showing single-file log (--follow)

Commit Ordering

• -r Reverse order (--reverse)
• -o Order commits by (--[topo|author-date|date]-order)

Formatting

• Default switches should persist as disabled if toggled off (graph and decorate)
• -g Show graph (--graph)
• -c Show graph in color (--color)
• -d Show refnames (--decorate)
• =S Show signatures (--show-signature)

Log

• l current
• h HEAD
• u related
• o other
• L local branches
• b all branches
• a all references
• B matching branches
• T matching tags
• m merged

Reflog

• r current
• H HEAD
• O other

Other

• s shortlog

Legend:

• Strikethrough items are currently not implemented, I'm checking them off to show progress towards coverage of currently implemented functionality
• Bolded switches default to enabled

Start by locating the log popup implementation and its existing test coverage, then compare it with the checklist in this issue. Focus on the unchecked switches and behaviors, including -L, reflog, history simplification, ordering, formatting, and remaining log or reflog entries. Done means the implemented functionality is covered and the checklist accurately reflects that coverage.