Enable wrapping words by default

Faced with a very long word, browsers will let it overflow its
box horizontally rather than break it in the middle. We essentially
never want that behavior. We would rather break the word and keep it
inside its horizontal limits. So we apply a default overflow-wrap:
break-word/anywhere to the document as a while.

In some contexts we would rather add a horizontal scrollbar (code
blocks), or elide the excess text with an ellipsis (sidebar). Those
still work as expected.

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

@@ -111,6 +111,12 @@ body {
 	font: 1rem/1.4 "Source Serif 4", NanumBarunGothic, serif;
 	margin: 0;
 	position: relative;
+	/* We use overflow-wrap: break-word for Safari, which doesn't recognize
+	   `anywhere`: https://developer.mozilla.org/en-US/docs/Web/CSS/overflow-wrap */
+	overflow-wrap: break-word;
+	/* Then override it with `anywhere`, which is required to make non-Safari browsers break
+	   more aggressively when we want them to. */
+	overflow-wrap: anywhere;
 
 	-webkit-font-feature-settings: "kern", "liga";
 	-moz-font-feature-settings: "kern", "liga";
@@ -446,6 +452,7 @@ nav.sub {
 	text-align: center;
 	border-bottom: 1px solid;
 	overflow-wrap: break-word;
+	overflow-wrap: anywhere;
 	word-wrap: break-word; /* deprecated */
 	word-break: break-word; /* Chrome, non-standard */
 }
@@ -576,6 +583,7 @@ nav.sub {
 }
 
 .docblock-short {
+	overflow-wrap: break-word;
 	overflow-wrap: anywhere;
 }
 .docblock-short p {
@@ -641,6 +649,7 @@ nav.sub {
 	flex-grow: 1;
 	margin: 0px;
 	padding: 0px;
+	overflow-wrap: break-word;
 	overflow-wrap: anywhere;
 }
 
@@ -669,6 +678,7 @@ nav.sub {
 	margin: .5em 0;
 	width: calc(100% - 2px);
 	overflow-x: auto;
+	overflow-wrap: normal;
 	display: block;
 }
 
@@ -1495,6 +1505,7 @@ pre.rust {
 	padding: 4px 8px;
 	text-align: center;
 	background: rgba(0,0,0,0);
+	overflow-wrap: normal;
 }
 
 #theme-choices > button:not(:first-child) {
@@ -2099,9 +2110,14 @@ details.rustdoc-toggle[open] > summary.hideme::after {
 	}
 
 	.docblock code {
+		overflow-wrap: break-word;
 		overflow-wrap: anywhere;
 	}
 
+	.docblock table code {
+		overflow-wrap: normal;
+	}
+
 	.sub-container {
 		flex-direction: column;
 	}