sw content controls: allow no list items in a dropdown

- Replace SwContentControl::HasListItems(), which assumed that the type
is dropdown if we have list items. This is not valid, it's OK to have
a dropdown with no list items. Add a GetDropDown() instead to check
for the type, explicitly.

- UNO API sets the dropdown bit when list items are set and the type is
not expilcitly combo box or drop down, to keep backwards
compatibility with existing documents.

- No change to the edit shell, SwDropDownContentControlButton already
checked if items are empty and used STR_DROP_DOWN_EMPTY_LIST in that
case, but that was dead code previously.

- ODT & DOCX filters are now updated, ODF has a new
<loext:content-control loext:dropdown="..."> attribute to specify that
the type is a dropdown, explicitly.

Change-Id: Id577ba9639151549a8f953aab31685a73a898504
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/142491
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins

1 files changed, 6 insertions, 2 deletions

diff --git a/offapi/com/sun/star/text/ContentControl.idl b/offapi/com/sun/star/text/ContentControl.idl
index ae8a0e1a9396..7bdb39fa5101 100644
--- a/offapi/com/sun/star/text/ContentControl.idl
+++ b/offapi/com/sun/star/text/ContentControl.idl
@@ -43,8 +43,6 @@ service ContentControl
     [optional, property] string UncheckedState;
 
     /** List items of a dropdown: DisplayText + Value pairs with string values for each item.
-
-        If the list is non-empty, a dropdown control is provided on the UI.
     */
     [optional, property] sequence< sequence< com::sun::star::beans::PropertyValue > > ListItems;
 
@@ -100,6 +98,12 @@ service ContentControl
     */
     [optional, property] boolean ComboBox;
 
+    /** Drop-down that does not allow free-form text, i.e. not combo box.
+
+        @since LibreOffice 7.5
+    */
+    [optional, property] boolean DropDown;
+
     /** The alias: kind of a human-readable title / description, show up on the UI.
 
         @since LibreOffice 7.5