Run cargo fmt

src/shell/layout/mod.rs

@@ -63,7 +63,7 @@ pub struct TilingExceptions {
 impl TilingExceptions {
     pub fn new<'a, I>(exceptions_config: I) -> Self
     where
-      I: Iterator<Item=&'a ApplicationException>
+        I: Iterator<Item = &'a ApplicationException>,
     {
         let mut app_ids = Vec::new();
         let mut titles = Vec::new();