Use the search title if configured

Allow commons to use Special:MediaSearch

Depends-On: 	I37b9d3a2b263f496a283f4bfdc769b7dc880ab06
Bug: T287540
Change-Id: I2a2463d704ef5b2264574cdf186836ba00a639f5

resources/skins.vector.search/App.vue

@@ -10,6 +10,7 @@
 		:title="searchTitle"
 		:placeholder="searchPlaceholder"
 		:aria-label="searchPlaceholder"
+		:search-page-title="searchPageTitle"
 		:initial-input-value="searchQuery"
 		:button-label="$i18n( 'searchbutton' ).text()"
 		:form-action="action"
@@ -74,6 +75,10 @@ module.exports = {
 		}
 	},
 	props: {
+		searchPageTitle: {
+			type: String,
+			default: 'Special:Search'
+		},
 		autofocusInput: {
 			type: Boolean,
 			default: false

resources/skins.vector.search/skins.vector.search.js

@@ -7,9 +7,11 @@ var
 /**
  * @param {HTMLElement} searchForm
  * @param {HTMLInputElement} search
+ * @param {string|null} searchPageTitle title of page used for searching e.g. Special:Search
+ *  If null then this will default to Special:Search.
  * @return {void}
  */
-function initApp( searchForm, search ) {
+function initApp( searchForm, search, searchPageTitle ) {
 	// eslint-disable-next-line no-new
 	new Vue( {
 		el: searchForm,
@@ -24,6 +26,7 @@ function initApp( searchForm, search ) {
 					autofocusInput: search === document.activeElement,
 					action: searchForm.getAttribute( 'action' ),
 					searchAccessKey: search.getAttribute( 'accessKey' ),
+					searchPageTitle: searchPageTitle,
 					searchTitle: search.getAttribute( 'title' ),
 					searchPlaceholder: search.getAttribute( 'placeholder' ),
 					searchQuery: search.value
@@ -42,9 +45,12 @@ function initApp( searchForm, search ) {
 function main( document ) {
 	var
 		searchForm = /** @type {HTMLElement} */ ( document.querySelector( '#searchform' ) ),
+		titleInput = /** @type {HTMLInputElement|null} */ (
+			searchForm.querySelector( 'input[name=title]' )
+		),
 		search = /** @type {HTMLInputElement|null} */ ( document.getElementById( 'searchInput' ) );
 	if ( search && searchForm ) {
-		initApp( searchForm, search );
+		initApp( searchForm, search, titleInput && titleInput.value );
 	}
 }
 main( document );