master 9b8a507: Don't error out when selection data is unavailable (bug#47642)

[Juri Linkov]

branch: master
commit 9b8a5070e5af506158e998e6125c3dab44fa8e5f
Author: Juri Linkov <juri@linkov.net>
Commit: Juri Linkov <juri@linkov.net>

    Don't error out when selection data is unavailable (bug#47642)
    
    * src/xselect.c (x_get_window_property_as_lisp_data):
    Display a message and return nil when data is not available.
---
 src/xselect.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/xselect.c b/src/xselect.c
index 030f624..cd6d86b 100644
--- a/src/xselect.c
+++ b/src/xselect.c
@@ -1482,14 +1482,21 @@ x_get_window_property_as_lisp_data (struct 
x_display_info *dpyinfo,
        = XGetSelectionOwner (display, selection_atom) != 0;
       unblock_input ();
       if (there_is_a_selection_owner)
-       signal_error ("Selection owner couldn't convert",
-                     actual_type
-                     ? list2 (target_type,
-                              x_atom_to_symbol (dpyinfo, actual_type))
-                     : target_type);
+       {
+         AUTO_STRING (format, "Selection owner couldn't convert: %s");
+         CALLN (Fmessage, format,
+                actual_type
+                ? list2 (target_type,
+                         x_atom_to_symbol (dpyinfo, actual_type))
+                : target_type);
+         return Qnil;
+       }
       else
-       signal_error ("No selection",
-                     x_atom_to_symbol (dpyinfo, selection_atom));
+       {
+         AUTO_STRING (format, "No selection: %s");
+         CALLN (Fmessage, format, x_atom_to_symbol (dpyinfo, selection_atom));
+         return Qnil;
+       }
     }
 
   if (actual_type == dpyinfo->Xatom_INCR)