vim: Add basic mark support (#11507)

Release Notes:
- vim: Added support for buffer-local marks (`'a-'z`) and some builtin
marks `'<`,`'>`,`'[`,`']`, `'{`, `'}` and `^`. Global marks (`'A-'Z`),
and other builtin marks (`'0-'9`, `'(`, `')`, `''`, `'.`, `'"`) are not
yet implemented. (#5122)

---------

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

crates/vim/src/utils.rs

@@ -39,6 +39,24 @@ fn copy_selections_content_internal(
     let mut text = String::new();
     let mut clipboard_selections = Vec::with_capacity(selections.len());
     let mut ranges_to_highlight = Vec::new();
+
+    vim.update_state(|state| {
+        state.marks.insert(
+            "[".to_string(),
+            selections
+                .iter()
+                .map(|s| buffer.anchor_before(s.start))
+                .collect(),
+        );
+        state.marks.insert(
+            "]".to_string(),
+            selections
+                .iter()
+                .map(|s| buffer.anchor_after(s.end))
+                .collect(),
+        )
+    });
+
     {
         let mut is_first = true;
         for selection in selections.iter() {