Re: [PATCH v10] show-branch: convert per-branch flags to commit-slab

While waiting for your signal to send the next version, I reviewed
the patch myself and found a few issues I want to address:

1. show_merge_base() has inconsistent indentation on the continuation
   line — has_all_rev_flags() is indented with a tab instead of
   spaces to align with the opening parenthesis. Should be:

       if (!(commit->object.flags & UNINTERESTING) &&
           has_all_rev_flags(commit, num_rev)) {

2. int _b is declared in the middle of the parents loop body in
   join_revs(). It should be declared at the top of that scope.

3. Regarding the {} block in join_revs() — as I explained earlier,
   it scopes commit_is_merge_base after mark_seen(). I can move the
   declaration to the top of the while loop body and remove the {}
   if you prefer that style.

4. Regarding test coverage — your footnote mentioned a gap since the
   test suite missed the basic crash. Should I add a test that simply
   runs git show-branch on two branches as a smoke test before sending
   the next version?

Please let me know what other issues you spotted and what signal
you need from me before I send the next version.

Vishweshwar