fix: Fix bug that allowed dragging blocks from a flyout onto a readonly workspace.

Author: gonfunko

core/flyout_base.ts

@@ -1103,7 +1103,7 @@ export abstract class Flyout
    * @internal
    */
   isBlockCreatable(block: BlockSvg): boolean {
-    return block.isEnabled();
+    return block.isEnabled() && !this.getTargetWorkspace().isReadOnly();
   }
 
   /**

core/gesture.ts

@@ -894,7 +894,7 @@ export class Gesture {
           'Cannot do a block click because the target block is ' + 'undefined',
         );
       }
-      if (this.targetBlock.isEnabled()) {
+      if (this.flyout.isBlockCreatable(this.targetBlock)) {
         if (!eventUtils.getGroup()) {
           eventUtils.setGroup(true);
         }