Only use jQuery.tipsy for undo popover

Per discussion on Gerrit about previous patch-sets in this change, only use
jQuery.tipsy for the undo popover. This means that in the common case (i.e.,
the user has not just changed languages), the ULS tooltip will be system native
tooltip.

Change-Id: I9206a79d59687930c26b7ef86d29bfba050691fe

Resources.php

@@ -112,7 +112,6 @@ $wgResourceModules['ext.uls.interface'] = array(
 	'scripts' => 'resources/js/ext.uls.interface.js',
 	'dependencies' => array(
 		'ext.uls.init',
-		'jquery.tipsy',
 		'mediawiki.jqueryMsg',
 		'mediawiki.user',
 		// We cannot delay the loading of the basic webfonts library

extension.json

@@ -197,7 +197,6 @@
 			"scripts": "js/ext.uls.interface.js",
 			"dependencies": [
 				"ext.uls.init",
-				"jquery.tipsy",
 				"mediawiki.jqueryMsg",
 				"mediawiki.user",
 				"ext.uls.webfonts"

resources/js/ext.uls.interface.js

@@ -174,9 +174,11 @@
 			autonym = $.cookie( mw.uls.previousLanguageAutonymCookie );
 
 		if ( autonym ) {
+			mw.loader.using( 'jquery.tipsy', function () {
 				deferred.resolve( autonym );
+			} );
 		} else {
-			mw.loader.using( 'jquery.uls.data', function () {
+			mw.loader.using( [ 'jquery.uls.data', 'jquery.tipsy' ], function () {
 				deferred.resolve( $.uls.data.getAutonym( code ) );
 			} );
 		}
@@ -184,12 +186,22 @@
 		return deferred.promise();
 	}
 
+	function userCanChangeLanguage() {
+		return mw.config.get( 'wgULSAnonCanChangeLanguage') || !mw.user.isAnon();
+	}
+
+	function userHasChangedLanguage() {
+		var previousLang = mw.uls.getPreviousLanguages().slice( -1 )[ 0 ],
+			currentLang = mw.config.get( 'wgUserLanguage' );
+		return previousLang && previousLang !== currentLang;
+	}
+
 	/**
 	 * The tooltip to be shown when language changed using ULS.
 	 * It also allows to undo the language selection.
 	 */
-	function showULSTooltip() {
-		var previousLang, $ulsTrigger, anonMode, showUndo, newLanguage, previousLanguages,
+	function showUndoTooltip() {
+		var previousLanguages, previousLang, $ulsTrigger,
 			ulsPosition = mw.config.get( 'wgULSPosition' ),
 			currentLang = mw.config.get( 'wgUserLanguage' ),
 			rtlPage = $( 'body' ).hasClass( 'rtl' ),
@@ -202,26 +214,11 @@
 			$( '.uls-settings-trigger' ) :
 			$( '.uls-trigger' );
 
-		previousLanguages = mw.uls.getPreviousLanguages() || [];
+		previousLanguages = mw.uls.getPreviousLanguages();
 		previousLang = previousLanguages.slice( -1 )[0];
 
-		// Whether we see current language for the first time
-		newLanguage = currentLang !== previousLang;
-		// Whether user is able to change language
-		anonMode = ( mw.user.isAnon() && !mw.config.get( 'wgULSAnonCanChangeLanguage' ) );
-		// Whether user is able to change language, and just did so
-		showUndo = !anonMode && newLanguage && previousLang !== undefined;
-
-		if ( newLanguage ) {
 		previousLanguages.push( currentLang );
 		mw.uls.setPreviousLanguages( previousLanguages );
-		}
-
-		if ( !showUndo ) {
-			// In interlanguage mode, we will have normal tooltip, make it look same using tipsy
-			$ulsTrigger.tipsy( { gravity: tipsyGravity[ulsPosition] } );
-			return;
-		}
 
 		getUndoAutonym( previousLang ).done( function( autonym ) {
 			// Attach a tipsy tooltip to the trigger
@@ -475,7 +472,9 @@
 					return false;
 				} );
 
-			showULSTooltip();
+			if ( userCanChangeLanguage() && userHasChangedLanguage() ) {
+				showUndoTooltip();
+			}
 
 			$( 'body' ).on( 'focus.imeinit', imeSelector, function () {
 				var $input = $( this );