Load the proxy data for is_text as well

Otherwise the text state changes over time

lib/git_exporter.py

@@ -72,7 +72,7 @@ class GitExporter:
 
     def commit_file(self, flat, file, size, md5):
         # have such files been detected as text mimetype before?
-        is_text = self.proxy_sha256.is_text(file.name)
+        is_text = self.proxy_sha256.is_text(flat.commit.package, file.name)
         if not is_text and is_binary_or_large(file.name, size):
             file_sha256 = self.proxy_sha256.get_or_put(
                 flat.commit.project,