Fix some bugs with vim objects

- softwrap interaction
- correct selection if cursor is on opening marker

crates/editor/src/movement.rs

@@ -369,6 +369,30 @@ pub fn find_boundary(
     map.clip_point(offset.to_display_point(map), Bias::Right)
 }
 
+pub fn chars_after(
+    map: &DisplaySnapshot,
+    mut offset: usize,
+) -> impl Iterator<Item = (char, Range<usize>)> + '_ {
+    map.buffer_snapshot.chars_at(offset).map(move |ch| {
+        let before = offset;
+        offset = offset + ch.len_utf8();
+        (ch, before..offset)
+    })
+}
+
+pub fn chars_before(
+    map: &DisplaySnapshot,
+    mut offset: usize,
+) -> impl Iterator<Item = (char, Range<usize>)> + '_ {
+    map.buffer_snapshot
+        .reversed_chars_at(offset)
+        .map(move |ch| {
+            let after = offset;
+            offset = offset - ch.len_utf8();
+            (ch, offset..after)
+        })
+}
+
 pub fn is_inside_word(map: &DisplaySnapshot, point: DisplayPoint) -> bool {
     let raw_point = point.to_point(map);
     let scope = map.buffer_snapshot.language_scope_at(raw_point);