change formatting of error tooltip

Libraries/iTasks/Extensions/Editors/DynamicEditor.icl

@@ -559,8 +559,8 @@ where
 				_                         =
 					Error $
 						concat
-							[ "\"", toString (argOf $ typeCodeOfDynamic cons), "\" and \""
-							, toString (typeCodeOfDynamic nextArg), "\" cannot be unified."
+							[ "Could not unify\n    ", toString (argOf $ typeCodeOfDynamic cons), "\nwith\n    "
+							, toString (typeCodeOfDynamic nextArg)
 							]
 
 		childValueOf :: !(!EditState, !E) -> Maybe Dynamic

Libraries/iTasks/UI/WebPublic/css/itasks.css

@@ -272,7 +272,7 @@ div.itasks-exception {
   padding: 8px 10px;
   font-size: 12px;
   line-height: 12px;
-  white-space: nowrap;
+  white-space: pre;
   box-shadow: 4px 4px 8px rgba(0, 0, 0, 0.3);
 }
 *.itasks-viewport [data-tooltip]:before {