Fix panic when opening proposed changes editor with reversed ranges (z…

…ed-industries#18599)

Closes zed-industries#18589

Release Notes:

- N/A

Co-authored-by: Antonio <antonio@zed.dev>

crates/editor/src/editor.rs

@@ -12257,12 +12257,9 @@ impl Editor {
  let buffer = self.buffer.read(cx);
  let mut new_selections_by_buffer = HashMap::default();
  for selection in self.selections.all::<usize>(cx) {
- for (buffer, mut range, _) in
+ for (buffer, range, _) in
  buffer.range_to_buffer_ranges(selection.start..selection.end, cx)
  {
- if selection.reversed {
- mem::swap(&mut range.start, &mut range.end);
- }
  let mut range = range.to_point(buffer.read(cx));
  range.start.column = 0;
  range.end.column = buffer.read(cx).line_len(range.end.row);