From e3695d9cfcc753be45cbee0733751f6950191145 Mon Sep 17 00:00:00 2001
From: su_v <suv-sf@users.sourceforge.net>
Date: Thu, 17 Sep 2015 02:33:36 +0200
Subject: Extensions. Interpolate attribute in group: use z-order instead of
 selection order for multiple selection

(bzr r14374)
---
 share/extensions/interp_att_g.inx |  1 +
 share/extensions/interp_att_g.py  | 13 +++++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/share/extensions/interp_att_g.inx b/share/extensions/interp_att_g.inx
index 39c043519..7a0ef1d5c 100644
--- a/share/extensions/interp_att_g.inx
+++ b/share/extensions/interp_att_g.inx
@@ -40,6 +40,7 @@
                 <item>cm</item>
                 <item>mm</item>
             </param>
+            <param name="zsort" type="boolean" _gui-text="Use Z-order" _gui-description="Workaround for reversed selection order in Live Preview cycles" gui-hidden="true">true</param>
         </page>
         <page name="Help" _gui-text="Help">
             <_param name="intro" type="description">This effect applies a value for any interpolatable attribute for all elements inside the selected group or for all elements in a multiple selection.</_param>
diff --git a/share/extensions/interp_att_g.py b/share/extensions/interp_att_g.py
index 0798f7f58..168e7ffb0 100755
--- a/share/extensions/interp_att_g.py
+++ b/share/extensions/interp_att_g.py
@@ -23,6 +23,7 @@ import string
 # local library
 import inkex
 import simplestyle
+from pathmodifier import zSort
 
 inkex.localize()
 
@@ -58,6 +59,10 @@ class InterpAttG(inkex.Effect):
                         action="store", type="string",
                         dest="unit", default="color",
                         help="Values unit.")
+        self.OptionParser.add_option("--zsort",
+                        action="store", type="inkbool",
+                        dest="zsort", default=True,
+                        help="use z-order instead of selection order")
         self.OptionParser.add_option("--tab",
                         action="store", type="string",
                         dest="tab",
@@ -116,8 +121,12 @@ class InterpAttG(inkex.Effect):
         return False
       if len( self.selected ) > 1:
         # multiple selection
-        self.collection = self.options.ids
-        for i in self.options.ids:
+        if self.options.zsort:
+            sorted_ids = zSort(self.document.getroot(),self.selected.keys())
+        else:
+            sorted_ids = self.options.ids
+        self.collection = list(sorted_ids)
+        for i in sorted_ids:
           path = '//*[@id="%s"]' % i
           self.collection[self.tot_el] = self.document.xpath(path, namespaces=inkex.NSS)[0]
           self.tot_el += 1
-- 
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