Fix lettering id-error and trims (#2711)

lib/lettering/font.py

@@ -365,7 +365,7 @@ class Font(object):
         line_break_indices = [i for i, t in enumerate(text) if t == "\n"]
         for group in destination_group.iterdescendants(SVG_GROUP_TAG):
             # make sure we are only looking at glyph groups
-            if group.get("id") != "glyph":
+            if not group.get("id", "").startswith("glyph"):
                 continue
 
             i += 1

lib/svg/svg.py

@@ -14,20 +14,13 @@ def get_document(node):
     return node.getroottree().getroot()
 
 
-def generate_unique_id(document_or_element, prefix="path"):
+def generate_unique_id(document_or_element, prefix="path", blocklist=None):
     if isinstance(document_or_element, etree._ElementTree):
         document = document_or_element.getroot()
     else:
         document = get_document(document_or_element)
 
-    doc_ids = {node.get('id') for node in document.iterdescendants() if 'id' in node.attrib}
-
-    i = 1
-    while True:
-        new_id = "%s%d" % (prefix, i)
-        if new_id not in doc_ids:
-            break
-        i += 1
+    new_id = document.get_unique_id(prefix, blacklist=blocklist)
 
     return new_id