[gimp-help] tools: fix crash with older version of libxml2

[Jacob Boerema <jboerema src gnome org>]

commit 5fb3e1ea6b3aca0ff58dd61c3a0d134127616c25
Author: Jacob Boerema <jgboerema gmail com>
Date:   Mon Jun 7 16:57:57 2021 -0400

    tools: fix crash with older version of libxml2
    
    The DamnedLies translation website relies on an older version
    of libxml2 which apparently doesn't have an interator for
    XmlAttr which means our pot files do not get regenerated
    and our translations get stuck.
    
    Let's work around this by using an alternative loop that
    doesn't use an iterator.
    
    Hopefully this is the only problem, but we will find out
    after we commit this.

 tools/xml2po/__init__.py | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)
---
diff --git a/tools/xml2po/__init__.py b/tools/xml2po/__init__.py
index 82fd020fa..735090acd 100644
--- a/tools/xml2po/__init__.py
+++ b/tools/xml2po/__init__.py
@@ -529,9 +529,23 @@ class XMLDocument(object):
 
         # Translate attributes if needed
         if node.properties and self.app.current_mode.getTreatedAttributes():
-            for p in node.properties:
+            # DamnedLies has an older python3 libxml2 without an iterator for XmlAttr, try to work around it
+            # Version using iterator
+            #for p in node.properties:
+            #    if p.name in self.app.current_mode.getTreatedAttributes():
+            #        self.processAttribute(node, p)
+
+            # ugly hack to iterate node.properties without iterator
+            p = node.properties
+            while p:
+                prev = p
                 if p.name in self.app.current_mode.getTreatedAttributes():
                     self.processAttribute(node, p)
+                p = node.properties.next
+                # It looks like we can't count on p.last
+                # Apparently last node in list points to itself (prev)
+                if p == prev:
+                    break
 
         outtxt = ''
         if restart: