fix: arguments.spaceAround not adding spaces when an arrow function…

… is the only argument (#606)

src/generation/generate.rs

@@ -7284,8 +7284,11 @@ where
         items.push_info(start_ln);
         items.push_info(start_lsil);
         items.push_signal(Signal::PossibleNewLine);
+        if space_around {
+          items.push_signal(Signal::SpaceIfNotTrailing);
+        }
         items.push_condition(conditions::indent_if_start_of_line(generated_node));
-        items.push_condition(if_true(
+        items.push_condition(if_true_or(
           "isDifferentLineAndStartLineIndentation",
           Rc::new(move |context| {
             let start_ln = context.resolved_line_number(start_ln)?;
@@ -7295,6 +7298,7 @@ where
             Some(is_different_line && is_different_start_line_indentation)
           }),
           Signal::NewLine.into(),
+          if space_around { Signal::SpaceIfNotTrailing.into() } else { PrintItems::new() },
         ));
       } else {
         let last_comma_token = nodes.last().and_then(|n| context.token_finder.get_next_token_if_comma(n));

tests/specs/general/Arguments_SpaceAround_True.txt

@@ -5,6 +5,8 @@ testing(1, 2, 3);
 testing({a: 5});
 testing({abcdefghijklmnop: true, bcdefg: false});
 testing(123456, 123456, 123456, 123456);
+then(() => ({abcdefghijklmnop: true, bcdefg: false}));
+then(() => done());
 
 [expect]
 testing( true );
@@ -20,6 +22,11 @@ testing(
     123456,
     123456,
 );
+then( () => ({
+    abcdefghijklmnop: true,
+    bcdefg: false,
+}) );
+then( () => done() );
 
 == should not add spaces on empty arguments ==
 testing()
@@ -28,3 +35,17 @@ testing() === true;
 [expect]
 testing();
 testing() === true;
+
+== should not add spaces when indented ==
+function test() {
+    then( () =>
+        abcdefghijklmnop()
+     );
+}
+
+[expect]
+function test() {
+    then( () =>
+        abcdefghijklmnop()
+    );
+}