When selecting a commit and using the 'Interactive Rebase function accessible from right click > `Rebase children of a0b1c2d3 interactively`, the list of messages is not scrollable.  When viewing a large number of commits, or selecting any commit more than about 15 commits from the head, this prevents being able to select, right click, or interact with that commit in any way.

If I wish to use this view to be able to squash commits or edit the message of a commit, it means I'm unable to select commits a significant depth below head.

A scrollbar does seem to be drawn on this window, but it is disabled and non-functionaliy.  The scrollbar for the wider window affects behaviour of the view displaying the contents of the currently-selected file in the commit, not the list of commits on the branch or work tree.

Expected behaviour:  When the number of commits exceeds the number of rows which can be displayed without that portion of the dialog scrolling, the vertical scroll-bar for commit messages should be enabled and allow viewing of older commits.

What actually happens:  The scrollbar seems to be disabled regardless of the number of commits displayed, leaving many older commits unable to be edited.

SRCTREEWIN-1604 claims that this was fixed in 2014, however the bug has been present through many recent releases.