Merge pull request #82442 from YuriSizov/theme-editor-release-me-from…

…-this-nightmare-where-i-try-to-escape-the-editor-but-it-doesnt-let-me-go-and-i-keep-running-and-running-and-eventually-a-little-leak-comes-out

Fix leak when closing theme editor preview tabs

editor/plugins/theme_editor_plugin.cpp

@@ -3583,6 +3583,8 @@ void ThemeEditor::_remove_preview_tab(int p_tab) {
 		}
 
 		preview_tabs_content->remove_child(preview_tab);
+		preview_tab->queue_free();
+
 		preview_tabs->remove_tab(p_tab);
 		_change_preview_tab(preview_tabs->get_current_tab());
 	}