5 files changed, 59 insertions, 2 deletions
diff --git a/mesonbuild/mformat.py b/mesonbuild/mformat.py
index 92729a0..1e134f5 100644
--- a/mesonbuild/mformat.py
+++ b/mesonbuild/mformat.py
@@ -536,7 +536,7 @@ class TrimWhitespaces(FullAstVisitor):
     def visit_ParenthesizedNode(self, node: mparser.ParenthesizedNode) -> None:
         self.enter_node(node)
 
-        is_multiline = node.lpar.whitespaces and '#' in node.lpar.whitespaces.value
+        is_multiline = node.lpar.lineno != node.rpar.lineno
         if is_multiline:
             self.indent_comments += self.config.indent_by
 
@@ -546,7 +546,8 @@ class TrimWhitespaces(FullAstVisitor):
         if is_multiline:
             node.inner.whitespaces.value = self.dedent(node.inner.whitespaces.value)
             self.indent_comments = self.dedent(self.indent_comments)
-            self.add_nl_after(node.inner)
+            if node.lpar.whitespaces and '\n' in node.lpar.whitespaces.value:
+                self.add_nl_after(node.inner)
 
         node.rpar.accept(self)
         self.move_whitespaces(node.rpar, node)
diff --git a/test cases/format/5 transform/default.expected.meson b/test cases/format/5 transform/default.expected.meson
index 18af2f8..4a9851a 100644
--- a/test cases/format/5 transform/default.expected.meson
+++ b/test cases/format/5 transform/default.expected.meson
@@ -36,6 +36,20 @@ a2 = [
 # space array
 a3 = [1, 2, 3]
 
+# multi line expression
+is_foo = (
+    true
+    and false
+    and true
+    and false
+    and true
+    and false
+    and true
+    and false
+    and true
+    and false
+)
+
 # no single comma function
 fct = files(
     'meson.build',  # force multiline
diff --git a/test cases/format/5 transform/muon.expected.meson b/test cases/format/5 transform/muon.expected.meson
index 0e6309c..3b61270 100644
--- a/test cases/format/5 transform/muon.expected.meson
+++ b/test cases/format/5 transform/muon.expected.meson
@@ -36,6 +36,20 @@ a2 = [
 # space array
 a3 = [1, 2, 3]
 
+# multi line expression
+is_foo = (
+    true
+    and false
+    and true
+    and false
+    and true
+    and false
+    and true
+    and false
+    and true
+    and false
+)
+
 # no single comma function
 fct = files(
     'meson.build', # force multiline
diff --git a/test cases/format/5 transform/options.expected.meson b/test cases/format/5 transform/options.expected.meson
index 9ed6ac2..84917c1 100644
--- a/test cases/format/5 transform/options.expected.meson
+++ b/test cases/format/5 transform/options.expected.meson
@@ -14,6 +14,20 @@ a2 = [ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 2
 # space array
 a3 = [ 1, 2, 3 ]
 
+# multi line expression
+is_foo = (
+  true
+  and false
+  and true
+  and false
+  and true
+  and false
+  and true
+  and false
+  and true
+  and false
+)
+
 # no single comma function
 fct = files(
   'meson.build'   # force multiline
diff --git a/test cases/format/5 transform/source.meson b/test cases/format/5 transform/source.meson
index 4482884..a3b326b 100644
--- a/test cases/format/5 transform/source.meson
+++ b/test cases/format/5 transform/source.meson
@@ -18,6 +18,20 @@ a2 = [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22
 # space array
 a3 = [ 1, 2, 3 ]
 
+# multi line expression
+is_foo = (
+    true
+    and false
+    and true
+    and false
+    and true
+    and false
+    and true
+    and false
+    and true
+    and false
+)
+
 # no single comma function
 fct = files(
     'meson.build',  # force multiline