Ensure newline after trailing line comments to prevent formatting issues

Author: TTOzzi

Sources/SwiftFormat/PrettyPrint/PrettyPrint.swift

@@ -479,6 +479,9 @@ public class PrettyPrinter {
         }
       }
       outputBuffer.write(comment.print(indent: currentIndentation))
+      if wasEndOfLine, (comment.kind == .line || comment.kind == .docLine) {
+        outputBuffer.writeNewlines(.hard, shouldIndentBlankLines: configuration.indentBlankLines)
+      }
 
     case .verbatim(let verbatim):
       outputBuffer.writeVerbatim(verbatim.print(indent: currentIndentation), length)

Tests/SwiftFormatTests/PrettyPrint/CommentTests.swift

@@ -1107,4 +1107,43 @@ final class CommentTests: PrettyPrintTestCase {
 
     assertPrettyPrintEqual(input: input, expected: input, linelength: 80)
   }
+
+  func testCommentWithAttributes() {
+    let input =
+      """
+      @foo // comment
+      @bar
+      import Baz
+
+      """
+    let expected =
+      """
+      @foo  // comment
+      @bar import Baz
+
+      """
+
+    assertPrettyPrintEqual(input: input, expected: expected, linelength: 80)
+  }
+
+  func testLineAndBlockCommentsWithAttributes() {
+    let input =
+      """
+      @foo // comment
+      @bar /* comment */
+      @zoo // comment
+      import Baz
+
+      """
+    let expected =
+      """
+      @foo  // comment
+      @bar /* comment */ @zoo  // comment
+      import Baz
+
+      """
+
+    assertPrettyPrintEqual(input: input, expected: expected, linelength: 80)
+  }
+
 }