fix 'left behind trailing whitespace' (#3761)

Author: rchaser53

src/visitor.rs

@@ -623,7 +623,7 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
             self.push_str(s);
         } else {
             let snippet = self.snippet(span);
-            self.push_str(snippet);
+            self.push_str(snippet.trim());
         }
         self.last_pos = source!(self, span).hi();
     }

tests/target/issue-3741.rs

@@ -0,0 +1,5 @@
+pub enum PublishedFileVisibility {
+    Public = sys::ERemoteStoragePublishedFileVisibility_k_ERemoteStoragePublishedFileVisibilityPublic as i32,
+    FriendsOnly = sys::ERemoteStoragePublishedFileVisibility_k_ERemoteStoragePublishedFileVisibilityFriendsOnly as i32,
+    Private = sys::ERemoteStoragePublishedFileVisibility_k_ERemoteStoragePublishedFileVisibilityPrivate as i32,
+}