implementing InputField UseCase in Sketcher EditDatumDialog

src/Mod/Sketcher/Gui/EditDatumDialog.cpp

@@ -93,6 +93,8 @@ void EditDatumDialog::exec(bool atCursor)
         Ui::InsertDatum ui_ins_datum;
         ui_ins_datum.setupUi(&dlg);
 
+        ui_ins_datum.lineEdit->setParamGrpPath("User parameter:History/Sketcher/SetDatum");
+
         double init_val;
         if (Constr->Type == Sketcher::Angle ||
             ((Constr->Type == Sketcher::DistanceX || Constr->Type == Sketcher::DistanceY) &&

src/Mod/Sketcher/Gui/InsertDatum.ui

@@ -27,7 +27,7 @@
       </widget>
      </item>
      <item>
-      <widget class="QLineEdit" name="lineEdit"/>
+      <widget class="Gui::InputField" name="lineEdit"/>
      </item>
     </layout>
    </item>
@@ -44,7 +44,15 @@
   </layout>
  </widget>
  <resources/>
- <connections>
+ <customwidgets>
+   <customwidget>
+     <class>Gui::InputField</class>
+     <extends>QLineEdit</extends>
+     <header>Gui/InputField.h</header>
+   </customwidget>
+ </customwidgets>
+
+  <connections>
   <connection>
    <sender>buttonBox</sender>
    <signal>accepted()</signal>