Copy mode search improvements:

- Add styles for the search marking styles (copy-mode-match-style and
  copy-mode-current-match-style).

- Show the current match (the one with the cursor on it) in a different style.

- Copying without a selection will copy the current match if there is one.

tmux.1

@@ -3717,6 +3717,22 @@ If suffixed by
 .Ql % ,
 this is a percentage of the window size.
 .Pp
+.It Ic copy-mode-match-style Ar style
+Set the style of search matches in copy mode.
+For how to specify
+.Ar style ,
+see the
+.Sx STYLES
+section.
+.Pp
+.It Ic copy-mode-current-match-style Ar style
+Set the style of the current search match in copy mode.
+For how to specify
+.Ar style ,
+see the
+.Sx STYLES
+section.
+.Pp
 .It Xo Ic mode-keys
 .Op Ic vi | emacs
 .Xc