Show correct number of characters selected (#16420)

crates/go_to_line/src/go_to_line.rs

@@ -221,6 +221,8 @@ impl Render for GoToLine {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use cursor_position::{CursorPosition, SelectionStats};
+    use editor::actions::SelectAll;
     use gpui::{TestAppContext, VisualTestContext};
     use indoc::indoc;
     use project::{FakeFs, Project};
@@ -335,6 +337,83 @@ mod tests {
         assert_single_caret_at_row(&editor, expected_highlighted_row, cx);
     }
 
+    #[gpui::test]
+    async fn test_unicode_characters_selection(cx: &mut TestAppContext) {
+        init_test(cx);
+
+        let fs = FakeFs::new(cx.executor());
+        fs.insert_tree(
+            "/dir",
+            json!({
+                "a.rs": "ēlo"
+            }),
+        )
+        .await;
+
+        let project = Project::test(fs, ["/dir".as_ref()], cx).await;
+        let (workspace, cx) = cx.add_window_view(|cx| Workspace::test_new(project.clone(), cx));
+        workspace.update(cx, |workspace, cx| {
+            let cursor_position = cx.new_view(|_| CursorPosition::new(workspace));
+            workspace.status_bar().update(cx, |status_bar, cx| {
+                status_bar.add_right_item(cursor_position, cx);
+            });
+        });
+
+        let worktree_id = workspace.update(cx, |workspace, cx| {
+            workspace.project().update(cx, |project, cx| {
+                project.worktrees(cx).next().unwrap().read(cx).id()
+            })
+        });
+        let _buffer = project
+            .update(cx, |project, cx| project.open_local_buffer("/dir/a.rs", cx))
+            .await
+            .unwrap();
+        let editor = workspace
+            .update(cx, |workspace, cx| {
+                workspace.open_path((worktree_id, "a.rs"), None, true, cx)
+            })
+            .await
+            .unwrap()
+            .downcast::<Editor>()
+            .unwrap();
+
+        workspace.update(cx, |workspace, cx| {
+            assert_eq!(
+                &SelectionStats {
+                    lines: 0,
+                    characters: 0,
+                    selections: 1,
+                },
+                workspace
+                    .status_bar()
+                    .read(cx)
+                    .item_of_type::<CursorPosition>()
+                    .expect("missing cursor position item")
+                    .read(cx)
+                    .selection_stats(),
+                "No selections should be initially"
+            );
+        });
+        editor.update(cx, |editor, cx| editor.select_all(&SelectAll, cx));
+        workspace.update(cx, |workspace, cx| {
+            assert_eq!(
+                &SelectionStats {
+                    lines: 1,
+                    characters: 3,
+                    selections: 1,
+                },
+                workspace
+                    .status_bar()
+                    .read(cx)
+                    .item_of_type::<CursorPosition>()
+                    .expect("missing cursor position item")
+                    .read(cx)
+                    .selection_stats(),
+                "After selecting a text with multibyte unicode characters, the character count should be correct"
+            );
+        });
+    }
+
     fn open_go_to_line_view(
         workspace: &View<Workspace>,
         cx: &mut VisualTestContext,