Related tdf#105922: step increment is a property of the shape

not of the gradient. Therefore don't reset selection in the gradient
list if step increment changes.
This hopefully fixes also the failing UI test

Change-Id: Ia3da23d80ee9601b40309a2f213bd3b2c850ff5a
Reviewed-on: https://gerrit.libreoffice.org/36508Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>

cui/source/tabpages/tpgradnt.cxx

@@ -318,7 +318,6 @@ IMPL_LINK_NOARG( SvxGradientTabPage, ChangeAutoStepHdl_Impl, CheckBox&, void )
         m_pMtrIncrement->Enable();
     }
     ModifiedHdl_Impl(m_pMtrIncrement);
-    m_pGradientLB->SetNoSelection();
 }
 
 void SvxGradientTabPage::ModifiedHdl_Impl( void* pControl )

uitest/writer_tests/backgrounds.py

@@ -43,8 +43,8 @@ class WriterBackgrounds(UITestCase):
                 document.StyleFamilies.PageStyles.Standard.FillGradient.StartIntensity, 100)
             self.assertEqual(
                 document.StyleFamilies.PageStyles.Standard.FillGradient.EndIntensity, 100)
-            #self.assertEqual(
-                #document.StyleFamilies.PageStyles.Standard.FillGradientName, 'Tango Green')
+            self.assertEqual(
+                document.StyleFamilies.PageStyles.Standard.FillGradientName, 'Tango Green')
         elif btn == 'btnhatch':
             self.assertEqual(
                 document.StyleFamilies.PageStyles.Standard.FillHatch.Style, SINGLE )