id(web): Fix Go to Line undercounting lines due to hard breaks

pkgs/id/web/src/goto-line.test.ts

@@ -407,6 +407,35 @@ describe("go-to-line across textblocks (#745)", () => {
     // Trailing paragraph sits at pos 12; its text starts at pos 13.
     expect(view.state.selection.from).toBe(13);
   });
+
+  it("rich doc with hard_break counts as multiple lines and jumps correctly", () => {
+    const doc = richSchema.node("doc", null, [
+      richSchema.node("paragraph", null, [
+        richSchema.text("foo"),
+        richSchema.node("hard_break"),
+        richSchema.text("bar"),
+      ]),
+      richSchema.node("paragraph", null, [richSchema.text("baz")]),
+    ]);
+    const { view, container } = createViewFromDoc(richSchema, doc);
+
+    triggerGotoLine(view);
+    const input = container.querySelector(".goto-line-input") as HTMLInputElement;
+    // 3 lines total: "foo", "bar", "baz"
+    expect(input.placeholder).toContain("3");
+    expect(input.max).toBe("3");
+
+    gotoLine(container, "2");
+    // First paragraph starts at pos 0, content at pos 1
+    // "foo" text size = 3, so hard_break starts at pos 4
+    // hard_break size = 1, so "bar" starts at pos 5
+    expect(view.state.selection.from).toBe(5);
+
+    triggerGotoLine(view);
+    gotoLine(container, "3");
+    // Second paragraph starts at pos 9, text "baz" at pos 10
+    expect(view.state.selection.from).toBe(10);
+  });
 });
 
 // ── Editor recreation (#718) ───────────────────────────────────────

pkgs/id/web/src/goto-line.ts

@@ -35,10 +35,23 @@ function getLineStarts(view: EditorView): number[] {
     if (!node.isTextblock) return true; // descend into block containers (lists, quotes, cells…)
     const contentStart = pos + 1;
     starts.push(contentStart);
-    const text = node.textContent;
-    for (let i = 0; i < text.length; i++) {
-      if (text[i] === "\n") starts.push(contentStart + i + 1);
-    }
+
+    let currentPos = contentStart;
+    node.forEach((child) => {
+      if (child.type.name === "hard_break") {
+        starts.push(currentPos + child.nodeSize);
+      } else if (child.isText) {
+        const text = child.text;
+        if (text) {
+          for (let i = 0; i < text.length; i++) {
+            if (text[i] === "\n") {
+              starts.push(currentPos + i + 1);
+            }
+          }
+        }
+      }
+      currentPos += child.nodeSize;
+    });
     return false; // inline content cannot contain another textblock
   });
   return starts;