trim trailing whitespaces (#14044)

Author: gftea

crates/ide/src/file_structure.rs

@@ -160,9 +160,9 @@ fn structure_node(node: &SyntaxNode) -> Option<StructureNode> {
                 let label = match target_trait {
                     None => format!("impl {}", target_type.syntax().text()),
                     Some(t) => {
-                        format!("impl {}{} for {}", 
-                            it.excl_token().map(|x| x.to_string()).unwrap_or_default(), 
-                            t.syntax().text(), 
+                        format!("impl {}{} for {}",
+                            it.excl_token().map(|x| x.to_string()).unwrap_or_default(),
+                            t.syntax().text(),
                             target_type.syntax().text(),
                         )
                     }