Improve positioning of "..." in collapsed impl block

Author: GuillaumeGomez

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

@@ -2200,7 +2200,7 @@ details.toggle:not([open]) > summary .docblock {
 	overflow-y: hidden;
 }
 details.toggle:not([open]) > summary .docblock > :first-child {
-	max-width: calc(100% - 1em);
+	max-width: 100%;
 	overflow: hidden;
 	width: fit-content;
 	white-space: nowrap;
@@ -2215,10 +2215,15 @@ details.toggle:not([open]) > summary .docblock > :first-child::after {
 	bottom: 0;
 	z-index: 1;
 	background-color: var(--main-background-color);
-	/* In case this ends up in a heading or a `<code>` item. */
-	font-weight: normal;
 	font: 1rem/1.5 "Source Serif 4", NanumBarunGothic, serif;
+	/* To make it look a bit better and not have it stuck to the preceding element. */
+	padding-left: 0.2em;
 }
+details.toggle:not([open]) > summary .docblock > div:first-child::after {
+	/* This is to make the "..." always appear at the bottom. */
+	padding-top: calc(1.5em + 0.75em - 1.2rem);
+}
+
 details.toggle > summary .docblock {
 	margin-top: 0.75em;
 }

tests/rustdoc-gui/impl-block-doc.goml

@@ -31,3 +31,12 @@ assert: (|impl_y| + |impl_height|) <= (|doc_y| + |doc_height|)
 call-function: ("compare-size-and-pos", {"nth_impl": 2})
 // The second impl block has a short line.
 assert: (|impl_y| + |impl_height|) >= (|doc_y| + |doc_height|)
+
+// FIXME: Needs `if` condition to make this test check that `padding-top` on the "..." element
+// is as expected for tables.
+call-function: ("compare-size-and-pos", {"nth_impl": 3})
+assert: (|impl_y| + |impl_height|) >= (|doc_y| + |doc_height|)
+call-function: ("compare-size-and-pos", {"nth_impl": 4})
+assert: (|impl_y| + |impl_height|) >= (|doc_y| + |doc_height|)
+call-function: ("compare-size-and-pos", {"nth_impl": 5})
+assert: (|impl_y| + |impl_height|) >= (|doc_y| + |doc_height|)

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

@@ -669,3 +669,24 @@ impl ImplDoc {
 impl ImplDoc {
     pub fn bar2() {}
 }
+
+/// | this::is::a::kinda::very::long::header::number::one | this::is::a::kinda::very::long::header::number::two | this::is::a::kinda::very::long::header::number::three |
+/// |-|-|-|
+/// | bla | bli | blob |
+impl ImplDoc {
+    pub fn bar3() {}
+}
+
+/// # h1
+///
+/// bla
+impl ImplDoc {
+    pub fn bar4() {}
+}
+
+/// * list
+/// * list
+/// * list
+impl ImplDoc {
+    pub fn bar5() {}
+}