Run collapsed GUI test in mobile mode as well

tests/rustdoc-gui/go-to-collapsed-elem.goml

@@ -9,13 +9,32 @@ property: ("#implementations-list .implementors-toggle", {"open": "false"})
 click: "//*[@class='sidebar']//a[@href='#method.must_use']"
 assert-property: ("#implementations-list .implementors-toggle", {"open": "true"})
 
-// Now we do the same through search result.
-// First we reload the page without the anchor in the URL.
+define-function: ("collapsed-from-search", (), block {
+    // Now we do the same through search result.
+    // First we reload the page without the anchor in the URL.
+    goto: "file://" + |DOC_PATH| + "/test_docs/struct.Foo.html"
+    // Then we collapse the section again...
+    property: ("#implementations-list .implementors-toggle", {"open": "false"})
+    // Then we run the search.
+    write: (".search-input", "foo::must_use")
+    wait-for: "//*[@id='search']//a[@href='../test_docs/struct.Foo.html#method.must_use']"
+    click: "//*[@id='search']//a[@href='../test_docs/struct.Foo.html#method.must_use']"
+    assert-property: ("#implementations-list .implementors-toggle", {"open": "true"})
+})
+
+call-function: ("collapsed-from-search", {})
+
+// Now running the same check but with mobile.
+size: (600, 600)
 goto: "file://" + |DOC_PATH| + "/test_docs/struct.Foo.html"
-// Then we collapse the section again...
+// We check that the implementors block is expanded.
+assert-property: ("#implementations-list .implementors-toggle", {"open": "true"})
+// We now collapse the implementors block.
 property: ("#implementations-list .implementors-toggle", {"open": "false"})
-// Then we run the search.
-write: (".search-input", "foo::must_use")
-wait-for: "//*[@id='search']//a[@href='../test_docs/struct.Foo.html#method.must_use']"
-click: "//*[@id='search']//a[@href='../test_docs/struct.Foo.html#method.must_use']"
+// First we expand the mobile menu.
+click: ".sidebar-menu-toggle"
+// Then we click on the link to the method to ensure it'll expand the implementors block.
+click: "//*[@class='sidebar shown']//a[@href='#method.must_use']"
 assert-property: ("#implementations-list .implementors-toggle", {"open": "true"})
+
+call-function: ("collapsed-from-search", {})