Migrate source code elements style to CSS variables

Author: GuillaumeGomez

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

@@ -1345,6 +1345,13 @@ a.test-arrow:hover {
 	border-bottom: 1px solid var(--border-color);
 	margin-bottom: 6px;
 }
+#source-sidebar div.files > a:hover, details.dir-entry summary:hover,
+#source-sidebar div.files > a:focus, details.dir-entry summary:focus {
+	background-color: var(--source-sidebar-background-hover);
+}
+#source-sidebar div.files > a.selected {
+	background-color: var(--source-sidebar-background-selected);
+}
 #sidebar-toggle > button {
 	font-size: inherit;
 	font-weight: bold;

src/librustdoc/html/static/css/themes/ayu.css

@@ -84,6 +84,8 @@ Original by Dempfi (https://github.com/dempfi/ayu)
 	--crate-search-div-hover-filter: invert(98%) sepia(12%) saturate(81%) hue-rotate(343deg)
 		brightness(113%) contrast(76%);
 	--crate-search-hover-border: #e0e0e0;
+	--source-sidebar-background-selected: #14191f;
+	--source-sidebar-background-hover: #14191f;
 }
 
 h1, h2, h3, h4 {
@@ -208,12 +210,8 @@ pre.rust .kw-2, pre.rust .prelude-ty {}
 	color: #fff;
 }
 #source-sidebar div.files > a:hover, details.dir-entry summary:hover,
-#source-sidebar div.files > a:focus, details.dir-entry summary:focus {
-	background-color: #14191f;
-	color: #ffb44c;
-}
+#source-sidebar div.files > a:focus, details.dir-entry summary:focus,
 #source-sidebar div.files > a.selected {
-	background-color: #14191f;
 	color: #ffb44c;
 }
 

src/librustdoc/html/static/css/themes/dark.css

@@ -79,6 +79,8 @@
 	--crate-search-div-hover-filter: invert(69%) sepia(60%) saturate(6613%) hue-rotate(184deg)
 		brightness(100%) contrast(91%);
 	--crate-search-hover-border: #2196f3;
+	--source-sidebar-background-selected: #333;
+	--source-sidebar-background-hover: #444;
 }
 
 .content .item-info::before { color: #ccc; }
@@ -105,14 +107,6 @@ details.rustdoc-toggle > summary::before {
 	color: #888;
 }
 
-#source-sidebar div.files > a:hover, details.dir-entry summary:hover,
-#source-sidebar div.files > a:focus, details.dir-entry summary:focus {
-	background-color: #444;
-}
-#source-sidebar div.files > a.selected {
-	background-color: #333;
-}
-
 .scraped-example-list .scrape-help {
 	border-color: #aaa;
 	color: #eee;

src/librustdoc/html/static/css/themes/light.css

@@ -76,6 +76,8 @@
 	--crate-search-div-hover-filter: invert(44%) sepia(18%) saturate(23%) hue-rotate(317deg)
 		brightness(96%) contrast(93%);
 	--crate-search-hover-border: #717171;
+	--source-sidebar-background-selected: #fff;
+	--source-sidebar-background-hover: #e0e0e0;
 }
 
 .content .item-info::before { color: #ccc; }
@@ -98,13 +100,6 @@ body.source .example-wrap pre.rust a {
 	color: #888;
 }
 
-#source-sidebar div.files > a:hover, details.dir-entry summary:hover,
-#source-sidebar div.files > a:focus, details.dir-entry summary:focus {
-	background-color: #E0E0E0;
-}
-#source-sidebar div.files > a.selected {
-	background-color: #fff;
-}
 .scraped-example-list .scrape-help {
 	border-color: #555;
 	color: #333;