Ensure drag/drop from the treeview works as expected on Firefox. Fixes #4429

web/pgadmin/tools/sqleditor/static/js/sqleditor.js

@@ -366,13 +366,19 @@ define('tools.querytool', [
       if(self.handler.is_query_tool) {
         self.query_tool_obj.setOption('dragDrop', true);
         self.query_tool_obj.on('drop', (editor, e) => {
+          /* Stop firefox from redirecting */
+          if(e.preventDefault) {
+            e.preventDefault();
+          }
+          if (e.stopPropagation) {
+            e.stopPropagation();
+          }
           var cursor = editor.coordsChar({
             left: e.x,
             top: e.y,
           });
           var dropDetails = JSON.parse(e.dataTransfer.getData('text'));
           e.codemirrorIgnore = true;
-          e.dataTransfer.clearData('text');
           editor.replaceRange(dropDetails.text, cursor);
           editor.focus();
           editor.setSelection({