fmt: fix blank line inserts between enum attribute comments (#18361)

Author: ttytm

vlib/v/fmt/fmt.v

@@ -422,6 +422,11 @@ fn (f Fmt) should_insert_newline_before_node(node ast.Node, prev_node ast.Node)
 				return false
 			}
 		}
+		if stmt is ast.EnumDecl {
+			if stmt.attrs.len > 0 && stmt.attrs[0].pos.line_nr - prev_line_nr <= 1 {
+				return false
+			}
+		}
 		if stmt is ast.FnDecl {
 			if stmt.attrs.len > 0 && stmt.attrs[0].pos.line_nr - prev_line_nr <= 1 {
 				return false

vlib/v/fmt/tests/enum_attributes_keep.vv

@@ -0,0 +1,16 @@
+// CollisionType is an enum that categorizes entities for the purpose of collision detection, used in Collider ECS component.
+// The flag attribute allows for multiple EntityType values to be combined, enabling entities to be categorized as multiple types.
+[flag]
+pub enum CollisionType {
+	obstacle
+	chicken
+	egg
+}
+
+// Another descriptive comment with a linebreak separated from the next enum decl.
+
+[flag]
+pub enum Direction {
+	left
+	right
+}