ClangFormat: Fix wrong comment indentation

Fixes: QTCREATORBUG-25539
Change-Id: Ifecc4bc2c0984319d858720d5bcd1788a9008e90
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/clangformat/tests/clangformat-test.cpp

@@ -704,4 +704,24 @@ void ClangFormatTest::testIndentFunctionArgumentOnNewLine()
               }));
 }
 
+void ClangFormatTest::testIndentCommentOnNewLine()
+{
+    insertLines(
+        {"/*!",
+         "    \\qmlproperty double Type::property",
+         " ",
+         "    \\brief The property of Type.",
+         "*/"
+        });
+    m_indenter->indent(*m_cursor, QChar::Null, TextEditor::TabSettings());
+    QCOMPARE(documentLines(),
+             (std::vector<QString>{
+                 "/*!",
+                 "    \\qmlproperty double Type::property",
+                 " ",
+                 "    \\brief The property of Type.",
+                 "*/"
+             }));
+}
+
 } // namespace ClangFormat::Internal