Fix wrong font being used for tooltips i icons

Author: GuillaumeGomez

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

@@ -1838,6 +1838,10 @@ instead, we check that it's not a "finger" cursor.
 	border-right: 3px solid var(--target-border-color);
 }
 
+a.tooltip {
+	font-family: var(--font-family);
+}
+
 .code-header a.tooltip {
 	color: inherit;
 	margin-right: 15px;

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

@@ -767,3 +767,17 @@ pub mod impls_indent {
         pub fn bar() {}
     }
 }
+
+pub mod tooltips {
+    pub struct X;
+
+    impl X {
+        pub fn bar() -> Vec<u8> {
+            Vec::new()
+        }
+    }
+
+    pub fn bar() -> Vec<u8> {
+        Vec::new()
+    }
+}