vim: Allow count and repeat for "r" and "shift-r" action (#13287)

Fixing the "r" action just involved adapting `normal_replace` to replace
multiple characters.

Fixing the "shift-r" command was less straightforward. The bindings for
`vim::BeforeNormal` in replace mode were being overwritten and several
other steps required for action repetition were not performed. Finally,
the cursor adjustment after re-entering normal mode was duplicated
(`vim::BeforeNormal` was now triggered correctly) so I removed the
special case for replace mode.

Release Notes:

- Fixed vim "r" action to accept a count argument
- Fixed vim "shift-r" action to accept a count argument and allow
repetition

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/vim/src/vim.rs

@@ -421,7 +421,7 @@ impl Vim {
             state.current_tx.take();
             state.current_anchor.take();
         });
-        if mode != Mode::Insert {
+        if mode != Mode::Insert && mode != Mode::Replace {
             self.take_count(cx);
         }
 
@@ -488,11 +488,6 @@ impl Vim {
                         if selection.is_empty() {
                             selection.end = movement::right(map, selection.start);
                         }
-                    } else if last_mode == Mode::Replace {
-                        if selection.head().column() != 0 {
-                            let point = movement::left(map, selection.head());
-                            selection.collapse_to(point, selection.goal)
-                        }
                     }
                 });
             })