rustdoc: put in rule to get alignment in desktop and mobile layouts

src/test/rustdoc-gui/item-info-alignment.goml

@@ -0,0 +1,10 @@
+// This test ensures that the "item-info" looks about the same
+// whether or not it's inside a toggle.
+goto: file://|DOC_PATH|/lib2/struct.ItemInfoAlignmentTest.html
+
+// First, we try it in "desktop" mode.
+size: (1200, 870)
+compare-elements-position: (".impl-items > .item-info", "summary > .item-info", ("x"))
+// Next, we try it in "mobile" mode (max-width: 700px).
+size: (650, 650)
+compare-elements-position: (".impl-items > .item-info", "summary > .item-info", ("x"))

src/test/rustdoc-gui/src/lib2/lib.rs

@@ -170,3 +170,13 @@ where
     type Output;
     fn index(&self, index: Idx) -> &Self::Output;
 }
+
+pub struct ItemInfoAlignmentTest;
+
+impl ItemInfoAlignmentTest {
+    /// This method has docs
+    #[deprecated]
+    pub fn foo() {}
+    #[deprecated]
+    pub fn bar() {}
+}