internal: Migrate remove_parentheses assist to SyntaxEditor

Author: Giga-Bowser

crates/ide-assists/src/handlers/remove_parentheses.rs

@@ -1,4 +1,8 @@
-use syntax::{ast, AstNode, SyntaxKind, T};
+use syntax::{
+    ast::{self, syntax_factory::SyntaxFactory},
+    syntax_editor::Position,
+    AstNode, SyntaxKind, T,
+};
 
 use crate::{AssistContext, AssistId, AssistKind, Assists};
 
@@ -40,6 +44,7 @@ pub(crate) fn remove_parentheses(acc: &mut Assists, ctx: &AssistContext<'_>) ->
         "Remove redundant parentheses",
         target,
         |builder| {
+            let mut editor = builder.make_editor(parens.syntax());
             let prev_token = parens.syntax().first_token().and_then(|it| it.prev_token());
             let need_to_add_ws = match prev_token {
                 Some(it) => {
@@ -48,9 +53,13 @@ pub(crate) fn remove_parentheses(acc: &mut Assists, ctx: &AssistContext<'_>) ->
                 }
                 None => false,
             };
-            let expr = if need_to_add_ws { format!(" {expr}") } else { expr.to_string() };
-
-            builder.replace(parens.syntax().text_range(), expr)
+            if need_to_add_ws {
+                let make = SyntaxFactory::new();
+                editor.insert(Position::before(parens.syntax()), make.whitespace(" "));
+                editor.add_mappings(make.finish_with_mappings());
+            }
+            editor.replace(parens.syntax(), expr.syntax());
+            builder.add_file_edits(ctx.file_id(), editor);
         },
     )
 }

docs/book/src/assists_generated.md

@@ -2974,7 +2974,7 @@ impl Walrus {
 
 
 ### `remove_parentheses`
-**Source:**  [remove_parentheses.rs](https://github.com/rust-lang/rust-analyzer/blob/master/crates/ide-assists/src/handlers/remove_parentheses.rs#L5) 
+**Source:**  [remove_parentheses.rs](https://github.com/rust-lang/rust-analyzer/blob/master/crates/ide-assists/src/handlers/remove_parentheses.rs#L9) 
 
 Removes redundant parentheses.