fix: Firefox invisible text cursor after dropping blocks (#2128)

* Made dropping block blur editor

* Small refactor

Author: matthewlipski

packages/core/src/editor/BlockNoteEditor.ts

@@ -1107,6 +1107,13 @@ export class BlockNoteEditor<
     this.prosemirrorView.focus();
   }
 
+  public blur() {
+    if (this.headless) {
+      return;
+    }
+    this.prosemirrorView.dom.blur();
+  }
+
   public onUploadStart(callback: (blockId?: string) => void) {
     this.onUploadStartCallbacks.push(callback);
 

packages/core/src/extensions/SideMenu/SideMenuPlugin.ts

@@ -738,6 +738,8 @@ export class SideMenuProsemirrorPlugin<
     if (this.view) {
       this.view.isDragOrigin = false;
     }
+
+    this.editor.blur();
   };
   /**
    * Freezes the side menu. When frozen, the side menu will stay