Index: src/wp-admin/css/widgets.css
===================================================================
--- src/wp-admin/css/widgets.css	(revision 48293)
+++ src/wp-admin/css/widgets.css	(working copy)
@@ -48,11 +48,6 @@
 	line-height: 1.23076923;
 }
 
-.widgets-holder-wrap .widget-inside label {
-	margin: 0.25em 0 0.5em;
-	display: inline-block;
-}
-
 .widget.widget-dirty .widget-control-close-wrapper {
 	display: none;
 }
@@ -796,6 +791,24 @@
 /* =Media Queries
 -------------------------------------------------------------- */
 
+@media screen and (max-width: 782px) {
+	/* Default widgets non-wrapping labels. */
+	.widgets-holder-wrap .widget-inside label {
+		margin: 0.25em 0 0.5em;
+		display: inline-block;
+	}
+
+	/*
+	 * Default widgets now use a non-wrapping label. Custom widgets may still use
+	 * a wrapping one. This makes sure the wrapping label of the title inputs always
+	 * takes all the available width. Assumes all the title input labels `for`
+	 * attributes end with `title`.
+	 */
+	.widgets-holder-wrap .widget-inside label[for$="title"] {
+		display: inline;
+	}
+}
+
 @media screen and (max-width: 480px) {
 	div.widget-liquid-left {
 		width: 100%;