Show LibO's custom checkboxes in native fpicker

Change-Id: I9cd6b0b393024957c3dec1bd7e381db62f711a24

vcl/unx/kde5/KDE5FilePicker.cxx

@@ -153,20 +153,6 @@ QString KDE5FilePicker::getLabel(sal_Int16 controlId) const
     return label;
 }*/
 
-/*void KDE5FilePicker::addCheckBox(sal_Int16 controlId, const QString& label, bool hidden)
-{
-    auto resString = label;
-    resString.replace('~', '&');
-
-    auto widget = new QCheckBox(resString, _extraControls);
-    widget->setHidden(hidden);
-    if (!hidden)
-    {
-        _layout->addWidget(widget);
-    }
-    _customWidgets.insert(controlId, widget);
-}*/
-
 /*void KDE5FilePicker::initialize(bool saveDialog)
 {
     //default is opening

vcl/unx/kde5/KDE5FilePicker2.cxx

@@ -303,6 +303,17 @@ void KDE5FilePicker::addCustomControl(sal_Int16 controlId)
             // the checkbox is created even for CHECKBOX_AUTOEXTENSION to simplify
             // code, but the checkbox is hidden and ignored
             bool hidden = controlId == CHECKBOX_AUTOEXTENSION;
+            auto resString = toQString(VclResId(resId));
+            resString.replace('~', '&');
+
+            auto widget = new QCheckBox(resString, _extraControls);
+            widget->setHidden(hidden);
+            if (!hidden)
+            {
+                _layout->addWidget(widget);
+            }
+            _customWidgets.insert(controlId, widget);
+
             break;
         }
         case PUSHBUTTON_PLAY: