Catch the edge case where a space is returned both as an Erfa and a Chaostreff by SMW

generate_map.py

@@ -560,15 +560,6 @@ def create_svg(ns, bbox):
                 ts.append((xt*scalex - origin[0], origin[1] - yt*scaley))
             shapes_countries.append((name, ts))
 
-    chaostreffs = {}
-    with open(ns.cache_directory.chaostreff_info, 'r') as f:
-        ctdata = json.load(f)
-    for city, location in ctdata.items():
-        if location is None:
-            continue
-        xt, yt = transformer.transform(*location)
-        chaostreffs[city] = (xt*scalex - origin[0], origin[1] - yt*scaley)
-
     erfas = {}
     with open(ns.cache_directory.erfa_info, 'r') as f:
         ctdata = json.load(f)
@@ -578,6 +569,21 @@ def create_svg(ns, bbox):
         xt, yt = transformer.transform(*location)
         erfas[city] = (xt*scalex - origin[0], origin[1] - yt*scaley)
 
+    chaostreffs = {}
+    with open(ns.cache_directory.chaostreff_info, 'r') as f:
+        ctdata = json.load(f)
+    for city, location in ctdata.items():
+        if location is None:
+            continue
+        if city in erfas:
+            # There is an edge case where when a space changed states between Erfa and Chaostreff, the
+            # Semantic MediaWiki engine returns this space as both an Erfa and a Chaostreff, resulting
+            # in glitches in the rendering.  As a workaround, here we simply assume that it's an Erfa.
+            continue
+        xt, yt = transformer.transform(*location)
+        chaostreffs[city] = (xt*scalex - origin[0], origin[1] - yt*scaley)
+
+
     rectbox = [0, 0, svg_box[0], svg_box[1]]
     for name, shape in shapes_states + shapes_countries:
         for lon, lat in shape: