fix build with QScintilla <2.10

Author: jef-n

src/gui/qgsexpressionbuilderwidget.cpp

@@ -123,7 +123,11 @@ QgsExpressionBuilderWidget::QgsExpressionBuilderWidget( QWidget *parent )
   txtExpressionString->indicatorDefine( QgsCodeEditor::SquiggleIndicator, QgsExpression::ParserError::FunctionWrongArgs );
   txtExpressionString->indicatorDefine( QgsCodeEditor::SquiggleIndicator, QgsExpression::ParserError::FunctionInvalidParams );
   txtExpressionString->indicatorDefine( QgsCodeEditor::SquiggleIndicator, QgsExpression::ParserError::FunctionNamedArgsError );
+#if defined(QSCINTILLA_VERSION) && QSCINTILLA_VERSION >= 0x20a00
   txtExpressionString->indicatorDefine( QgsCodeEditor::TriangleIndicator, QgsExpression::ParserError::Unknown );
+#else
+  txtExpressionString->indicatorDefine( QgsCodeEditor::SquiggleIndicator, QgsExpression::ParserError::Unknown );
+#endif
 
   // Set all the error markers as red. -1 is all.
   txtExpressionString->setIndicatorForegroundColor( QColor( Qt::red ), -1 );