Formatting: Fixed comment handling before %start

crates/parol-ls/data/expected/options_default/block_comments_before_start.par

@@ -0,0 +1,10 @@
+/*
+   BC1
+*/
+%start OptionalAlternatives
+
+%%
+
+OptionalAlternatives
+    : [ "x" | "y" | "z" ]
+    ;

crates/parol-ls/data/expected/options_default/line_comments_before_start.par

@@ -0,0 +1,9 @@
+// LC1
+// LC2
+%start OptionalAlternatives
+
+%%
+
+OptionalAlternatives
+    : [ "x" | "y" | "z" ]
+    ;

crates/parol-ls/data/expected/prod_semicolon_on_nl_false/block_comments_before_start.par

@@ -0,0 +1,9 @@
+/*
+   BC1
+*/
+%start OptionalAlternatives
+
+%%
+
+OptionalAlternatives
+    : [ "x" | "y" | "z" ];

crates/parol-ls/data/expected/prod_semicolon_on_nl_false/line_comments_before_start.par

@@ -0,0 +1,8 @@
+// LC1
+// LC2
+%start OptionalAlternatives
+
+%%
+
+OptionalAlternatives
+    : [ "x" | "y" | "z" ];

crates/parol-ls/data/input/block_comments_before_start.par

@@ -0,0 +1,6 @@
+/*
+   BC1
+*/
+%start OptionalAlternatives
+%%
+OptionalAlternatives: [ "x" | "y" | "z" ];

crates/parol-ls/data/input/line_comments_before_start.par

@@ -0,0 +1,5 @@
+// LC1
+// LC2
+%start OptionalAlternatives
+%%
+OptionalAlternatives: [ "x" | "y" | "z" ];

crates/parol-ls/src/format.rs

@@ -672,14 +672,23 @@ impl Fmt for SimpleTokenOpt {
 }
 impl Fmt for StartDeclaration {
     fn txt(&self, options: &FmtOptions) -> String {
-        let comment_options_left = options.clone().with_padding(Padding::Left);
-        let comment_options_right = options.clone().with_padding(Padding::Right);
+        let comment_options_top = if let Some(last_comment) = self.comments.comments_list.last() {
+            match &*last_comment.comment {
+                Comment::BlockComment(_) => {
+                    options.clone().with_line_end(LineEnd::ForceSingleNewline)
+                }
+                Comment::LineComment(_) => options.clone(),
+            }
+        } else {
+            options.clone()
+        };
+        let comment_options_bottom = options.clone().with_padding(Padding::Left);
         format!(
             "{}{} {}{}\n",
-            handle_comments(&self.comments, &comment_options_right),
+            handle_comments(&self.comments, &comment_options_top),
             self.percent_start,
             self.identifier.txt(options),
-            handle_comments(&self.comments0, &comment_options_left),
+            handle_comments(&self.comments0, &comment_options_bottom),
         )
     }
 }