Trying to add commands to clones now shows an error. (#3034)

* Trying to add commands to clones now shows an error.

* warn about ignored clones and continue

---------

Co-authored-by: Kaalleen <reni@allenka.de>

lib/extensions/object_commands.py

@@ -3,9 +3,10 @@
 # Copyright (c) 2010 Authors
 # Licensed under the GNU GPL version 3.0 or later.  See the file LICENSE for details.
 
-import inkex
+from inkex import errormsg
 
 from ..commands import OBJECT_COMMANDS, add_commands
+from ..elements import Clone
 from ..i18n import _
 from .commands import CommandsExtension
 
@@ -18,7 +19,7 @@ class ObjectCommands(CommandsExtension):
             return
 
         if not self.svg.selection:
-            inkex.errormsg(_("Please select one or more objects to which to attach commands."))
+            errormsg(_("Please select one or more objects to which to attach commands."))
             return
 
         self.svg = self.document.getroot()
@@ -26,14 +27,24 @@ class ObjectCommands(CommandsExtension):
         commands = [command for command in self.COMMANDS if getattr(self.options, command)]
 
         if not commands:
-            inkex.errormsg(_("Please choose one or more commands to attach."))
+            errormsg(_("Please choose one or more commands to attach."))
             return
 
+        # Clones currently can't really take any commands, so error if we try to add one to them.
+        clones = [e for e in self.elements if isinstance(e, Clone)]
+        if clones:
+            errormsg(_(
+                "Cannot attach commands to Clone element(s) {clones}. "
+                "They must be unlinked to add commands.\n"
+                "* Select the clone(s)\n"
+                "* Run: Extensions > Ink/Stitch > Edit > Unlink Clone"
+            ).format(clones=", ".join(c.node.get_id() for c in clones)))
+
         # Each object (node) in the SVG may correspond to multiple Elements of different
         # types (e.g. stroke + fill).  We only want to process each one once.
         seen_nodes = set()
 
         for element in self.elements:
-            if element.node not in seen_nodes and element.shape:
+            if element.node not in seen_nodes and element.shape and not isinstance(element, Clone):
                 add_commands(element, commands)
                 seen_nodes.add(element.node)