when gtk3 >= 3.22.0 set natural size propagate

so 1-10 in format numbering etc isn't slightly clipped
with a scrollbar on top of it

Change-Id: I55909993d4b4c846ca0aeff2f2cd458dfa59d860
Reviewed-on: https://gerrit.libreoffice.org/61262
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/unx/gtk3/gtk3gtkinst.cxx

@@ -5387,6 +5387,17 @@ private:
             if (gtk_label_get_use_underline(pLabel))
                 m_aMnemonicLabels.push_back(pLabel);
         }
+        else if (GTK_IS_SCROLLED_WINDOW(pWidget))
+        {
+#if GTK_CHECK_VERSION(3, 22, 0)
+            // while the .ui version is 3.18, do this in code when possible
+            if (gtk_check_version(3, 22, 0) == nullptr)
+            {
+                gtk_scrolled_window_set_propagate_natural_width(GTK_SCROLLED_WINDOW(pWidget), true);
+                gtk_scrolled_window_set_propagate_natural_height(GTK_SCROLLED_WINDOW(pWidget), true);
+            }
+#endif
+        }
         else if (GTK_IS_WINDOW(pWidget))
         {
             if (m_pStringReplace != nullptr) {