Due to the formatting placeholders sitting on the previous line, the
coloring of the topmost line disappeared when scrolling (as the escape
sequence scrolled away). This had the background that I wanted the code
that sets up the format string to be very readable and if possible very
close to the actual output. And since the colors have all different
lengths I decided to place them on the previous line to have them out of
the way.
Fix this by placing the placeholders on the same output line while still
maintaining a readable format string (code). This is done by joining the
array without placing newlines so that it can now have multiple elements
for one output line and formatting those as wished.
Switch to using the `change-preview()` action that was introduced in
0.29.0 (which was actually not yet released for a year when this feature
was first written). The old `preview()` is a one-off action while
`change-preview()` changes the `--preview` option.
This had the downside that when changing to a different preview and
moving to the next commit one would had to repeat the change. This was
especially annoying when looking through the history of a file that was
renamed. With the commit that renamed the file all previous commits
broke in the `files_only` preview as the path didn't exist yet (A
possible but probably pretty hard TODO to fix).
TODO: glog: Fix files_only preview for renamed files or give prompt to
change the paths
When file arguments were passes behind `--`, show only these files in
the patch preview. This mimics the behaviour of `git log -up --
<files>`.
The full patch can still be displayed with ctrl-p.
