FEM: vtk, post task boxes, add some comment

src/Mod/Fem/Gui/TaskPostBoxes.cpp

@@ -1123,6 +1123,10 @@ void TaskPostWarpVector::on_Max_valueChanged(double) {
      * problem, if warp_factor is 2000 one would like to input 4000 as max, one starts to input 4
      * immediately the warp_factor is changed to 4 because 4 < 2000, but one has just input one character of his 4000
      * I do not know how to solve this, but the code to set slider and spinbox is fine thus I leave it ... 
+     * 
+     * mhh it works if "apply changes to pipeline directly" button is deactivated, still it really confuses if
+     * the button is active. More investigation is needed.
+     * 
     // set warp factor to max, if warp factor > max
     if (ui->Value->value() > ui->Max->value()) {
         double warp_factor = ui->Max->value();