Rollup merge of #118677 - GuillaumeGomez:doc_cfg-display, r=notriddle

[rustdoc] Fix display of features

Fixes https://github.com/rust-lang/rust/issues/118615.

It now looks like this:

![image](https://github.com/rust-lang/rust/assets/3050060/6e77204e-0706-44a3-89ae-2dbd1934ebbc)

We can't use flex without breaking the flow, meaning we can't vertically align items as we want. Because of that, the `min-height` was problematic as it rendered weirdly and therefore needed to be removed.

r? `@notriddle`

src/librustdoc/html/static/css/rustdoc.css

@@ -1081,15 +1081,9 @@ so that we can apply CSS-filters to change the arrow color in themes */
 }
 
 .item-info .stab {
-	/* This min-height is needed to unify the height of the stab elements because some of them
-	   have emojis.
-	*/
-	min-height: 36px;
-	display: flex;
+	display: block;
 	padding: 3px;
 	margin-bottom: 5px;
-	align-items: center;
-	vertical-align: text-bottom;
 }
 .item-name .stab {
 	margin-left: 0.3125em;
@@ -1112,17 +1106,26 @@ so that we can apply CSS-filters to change the arrow color in themes */
 	color: var(--stab-code-color);
 }
 
-.stab .emoji {
+.stab .emoji, .item-info .stab::before {
 	font-size: 1.25rem;
+}
+.stab .emoji {
 	margin-right: 0.3rem;
 }
+.item-info .stab::before {
+	/* ensure badges with emoji and without it have same height */
+	content: "\0";
+	width: 0;
+	display: inline-block;
+	color: transparent;
+}
 
 /* Black one-pixel outline around emoji shapes */
 .emoji {
 	text-shadow:
 		1px 0 0 black,
 		-1px 0 0 black,
-		0  1px 0 black,
+		0 1px 0 black,
 		0 -1px 0 black;
 }
 

tests/rustdoc-gui/item-info.goml

@@ -8,7 +8,22 @@ assert-size: (".item-info", {"width": 840})
 assert-size: (".item-info .stab", {"width": 289})
 assert-position: (".item-info .stab", {"x": 245})
 
+// We check that the display of the feature elements is not broken. It serves as regression
+// test for <https://github.com/rust-lang/rust/issues/118615>.
+set-window-size: (850, 800)
+store-position: (
+    "//*[@class='stab portability']//code[text()='Win32_System']",
+    {"x": first_line_x, "y": first_line_y},
+)
+store-position: (
+    "//*[@class='stab portability']//code[text()='Win32_System_Diagnostics']",
+    {"x": second_line_x, "y": second_line_y},
+)
+assert: |first_line_x| != |second_line_x| && |first_line_x| == 516 && |second_line_x| == 272
+assert: |first_line_y| != |second_line_y| && |first_line_y| == 688 && |second_line_y| == 711
+
 // Now we ensure that they're not rendered on the same line.
+set-window-size: (1100, 800)
 go-to: "file://" + |DOC_PATH| + "/lib2/trait.Trait.html"
 // We first ensure that there are two item info on the trait.
 assert-count: ("#main-content > .item-info .stab", 2)

tests/rustdoc-gui/src/lib2/Cargo.toml

@@ -6,6 +6,13 @@ edition = "2018"
 [lib]
 path = "lib.rs"
 
+[features]
+Win32 = ["Win32_System"]
+Win32_System = ["Win32_System_Diagnostics"]
+Win32_System_Diagnostics = ["Win32_System_Diagnostics_Debug"]
+Win32_System_Diagnostics_Debug = []
+default = ["Win32"]
+
 [dependencies]
 implementors = { path = "./implementors" }
 http = { path = "./http" }

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

@@ -1,6 +1,7 @@
 // ignore-tidy-linelength
 
 #![feature(doc_cfg)]
+#![feature(doc_auto_cfg)]
 
 pub mod another_folder;
 pub mod another_mod;
@@ -28,6 +29,14 @@ impl Foo {
     /// Some documentation
     /// # A Heading
     pub fn a_method(&self) {}
+
+    #[cfg(all(
+        feature = "Win32",
+        feature = "Win32_System",
+        feature = "Win32_System_Diagnostics",
+        feature = "Win32_System_Diagnostics_Debug"
+    ))]
+    pub fn lot_of_features() {}
 }
 
 #[doc(cfg(feature = "foo-method"))]