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/clangformatbaseindenter.cpp

@@ -250,7 +250,7 @@ QByteArray dummyTextForContext(CharacterContext context, bool closingBraceBlock)
     case CharacterContext::IfOrElseWithoutScope:
         return ";";
     case CharacterContext::NewStatementOrContinuation:
-        return "/**/";
+        return "/*//*/";
     case CharacterContext::Unknown:
     default:
         QTC_ASSERT(false, return "";);
@@ -302,7 +302,7 @@ int forceIndentWithExtraText(QByteArray &buffer,
     }
 
     // A comment at the end of the line appears to prevent clang-format from removing line breaks.
-    if (dummyText == "/**/" || dummyText.isEmpty()) {
+    if (dummyText == "/*//*/" || dummyText.isEmpty()) {
         if (block.previous().isValid()) {
             const int prevEndOffset = Utils::Text::utf8NthLineOffset(block.document(), buffer,
                     block.blockNumber()) + block.previous().text().length();

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

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

@@ -90,6 +90,7 @@ private slots:
     void testClassIndentStructure();
     void testIndentInitializeVector();
     void testIndentFunctionArgumentOnNewLine();
+    void testIndentCommentOnNewLine();
 
 private:
     void insertLines(const std::vector<QString> &lines);