Fix panic in visual line mode with folds (#10284)

Fixes: #10266



Release Notes:

- Added/Fixed/Improved ...
([#<public_issue_number_if_exists>](https://github.com/zed-industries/zed/issues/<public_issue_number_if_exists>)).

Optionally, include screenshots / media showcasing your addition that
can be included in the release notes.

**or**

- N/A

crates/editor/src/display_map.rs

@@ -433,7 +433,10 @@ impl DisplaySnapshot {
         } else if range.start.row == self.max_buffer_row()
             || (range.end.column > 0 && range.end.row == self.max_buffer_row())
         {
-            Point::new(range.start.row - 1, self.line_len(range.start.row - 1))
+            Point::new(
+                range.start.row - 1,
+                self.buffer_snapshot.line_len(range.start.row - 1),
+            )
         } else {
             self.prev_line_boundary(range.start).0
         };

crates/vim/src/test.rs

@@ -634,6 +634,25 @@ async fn test_folds_panic(cx: &mut gpui::TestAppContext) {
     cx.simulate_shared_keystrokes(["g", "g"]).await;
     cx.simulate_shared_keystrokes(["5", "d", "j"]).await;
     cx.assert_shared_state(indoc! { "ˇ"}).await;
+
+    cx.set_shared_state(indoc! { "
+            fn boop() {
+              ˇbarp()
+              bazp()
+            }
+        "})
+        .await;
+    cx.simulate_shared_keystrokes(["shift-v", "j", "j", "z", "f"])
+        .await;
+    cx.simulate_shared_keystrokes(["escape"]).await;
+    cx.simulate_shared_keystrokes(["shift-g", "shift-v"]).await;
+    cx.assert_shared_state(indoc! { "
+            fn boop() {
+              barp()
+              bazp()
+            }
+            ˇ"})
+        .await;
 }
 
 #[gpui::test]
@@ -1038,12 +1057,3 @@ async fn test_undo(cx: &mut gpui::TestAppContext) {
         3"})
         .await;
 }
-
-#[gpui::test]
-async fn test_command_palette(cx: &mut gpui::TestAppContext) {
-    let mut cx = VimTestContext::new(cx, true).await;
-    cx.simulate_keystroke(":");
-    cx.simulate_input("go to definition");
-    assert!(cx.debug_bounds("KEY_BINDING-f12").is_none());
-    assert!(cx.debug_bounds("KEY_BINDING-g d").is_some());
-}

crates/vim/test_data/test_folds_panic.json

@@ -11,3 +11,13 @@
 {"Key":"d"}
 {"Key":"j"}
 {"Get":{"state":"ˇ","mode":"Normal"}}
+{"Put":{"state":"fn boop() {\n  ˇbarp()\n  bazp()\n}\n"}}
+{"Key":"shift-v"}
+{"Key":"j"}
+{"Key":"j"}
+{"Key":"z"}
+{"Key":"f"}
+{"Key":"escape"}
+{"Key":"shift-g"}
+{"Key":"shift-v"}
+{"Get":{"state":"fn boop() {\n  barp()\n  bazp()\n}\nˇ","mode":"VisualLine"}}