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The ulsPopup variable is local to the showUndoTooltip() function. If it is called multiple times, then a previous assignment of an OO.ui.PopupWidget object would not be found here in subsequent calls. This check can only ever be false since it is the first statement in the function (after variable and function declarations, which don't do anything other than call `$()`). Change-Id: I7020c103428d01b5e48c65be695471401f588fc4
== Universal Language Selector == The Universal Language Selector extension (ULS) provides a flexible way to configure and deliver language settings like interface language, fonts, and input methods (keyboard mappings). This will allow users to type text in different languages not directly supported by their keyboard, read content in a script for which fonts are not available locally, or customise the language in which menus are displayed. For more information see: https://www.mediawiki.org/wiki/Universal_Language_Selector == Copying == You may use any Project Milkshake product, including the Universal Language Selector, under the terms of either the MIT License or the GNU General Public License (GPL) Version 2 or later. See GPL-LICENSE and MIT-LICENSE for details. == Installation == For a very, very quick start add the following lines to LocalSettings.php of your MediaWiki setup: wfLoadExtension( 'UniversalLanguageSelector' ); By default, ULS will appear at personal toolbar position. If you want ULS at interlanguage position, add the following line: $wgULSPosition = 'interlanguage'; == Developers == The MediaWiki Universal Language Selector project uses jquery.uls: https://github.com/wikimedia/jquery.uls Its development is at Wikimedia Github account. Any fixes to lib/ should happen at Github. Follow the build instructions of jquery.uls to create jquery.uls.js. Bugs for the extension are handled in Phabricator: https://phabricator.wikimedia.org/tag/mediawiki-extensions-universallanguageselector/