support api initiated change_event for combox & textbox

Change-Id: Iff51a184792e9d12accb902df1772fc07589443b

vbahelper/source/msforms/vbacombobox.cxx

@@ -120,7 +120,11 @@ void SAL_CALL
 ScVbaComboBox::setValue( const uno::Any& _value ) throw (uno::RuntimeException)
 {
     // booleans are converted to uppercase strings
+    OUString oldValue = extractStringFromAny( getValue(), OUString(), true );
     m_xProps->setPropertyValue( sSourceName, uno::Any( extractStringFromAny( _value, OUString(), true ) ) );
+    OUString newValue = extractStringFromAny( getValue(), OUString(), true );
+    if ( oldValue != newValue )
+        fireChangeEvent();
 }
 
 // see Value

vbahelper/source/msforms/vbatextbox.cxx

@@ -59,6 +59,7 @@ ScVbaTextBox::getText() throw (css::uno::RuntimeException)
 void SAL_CALL
 ScVbaTextBox::setText( const OUString& _text ) throw (css::uno::RuntimeException)
 {
+    OUString oldText( getText() );
     if ( !mbDialog )
     {
         uno::Reference< text::XTextRange > xTextRange( m_xProps, uno::UNO_QUERY_THROW );
@@ -66,6 +67,8 @@ ScVbaTextBox::setText( const OUString& _text ) throw (css::uno::RuntimeException
     }
     else
         m_xProps->setPropertyValue( "Text" , uno::makeAny( _text ) );
+    if ( oldText != _text )
+        fireChangeEvent();
 }
 
 sal_Int32 SAL_CALL