fix: Ensure visual indicating for focus loss.

src/line_cursor.ts

@@ -555,6 +555,22 @@ export class LineCursor extends Marker {
     this.updateFocusIndication(oldNode, newNode);
   }
 
+  override hide(): void {
+    super.hide();
+
+    // If there's a block currently selected, remove the selection since the
+    // cursor should now be hidden.
+    const curNode = this.getCurNode();
+    if (curNode.getType() === ASTNode.types.BLOCK) {
+      const block = curNode.getLocation() as Blockly.BlockSvg;
+      if (!block.isShadow()) {
+        Blockly.common.setSelected(null);
+      } else {
+        block.removeSelect();
+      }
+    }
+  }
+
   /**
    * Implements fake selection of shadow blocks as described in
    * documentation for setCurNode.

src/navigation.ts

@@ -544,7 +544,7 @@ export class Navigation {
    *  - Resume editing by returning the cursor to its previous location, if any.
    *  - Move the cursor to the top connection point on on the first top block.
    *  - Move the cursor to the default location on the workspace.
-   * 
+   *
    * @param workspace The main Blockly workspace.
    * @param keepPosition Whether to retain the cursor's previous position.
    */
@@ -1139,7 +1139,7 @@ export class Navigation {
     // Although it seems like this should never happen, the typings are wrong
     // in the base Marker class and this can therefore be null.
     if (this.markedNode) {
-      this.passiveFocusIndicator.show(this.markedNode);
+      // this.passiveFocusIndicator.show(this.markedNode);
     }
   }
 
@@ -1149,7 +1149,7 @@ export class Navigation {
    * @param workspace The workspace.
    */
   removeMark(workspace: Blockly.WorkspaceSvg) {
-    this.passiveFocusIndicator.hide();
+    // this.passiveFocusIndicator.hide();
     this.markedNode = null;
   }
 

src/navigation_controller.ts

@@ -159,6 +159,11 @@ export class NavigationController {
     this.hasNavigationFocus = isFocused;
     if (isFocused) {
       this.navigation.focusWorkspace(workspace, true);
+    } else {
+      // Hide cursor to indicate lost focus. Also, mark the current node so that
+      // it can be properly restored upon returning to the workspace.
+      this.navigation.markAtCursor(workspace);
+      workspace.getCursor()?.hide();
     }
   }