stubgen: sort import output

Author: tharvik

mypy/stubgen.py

@@ -477,9 +477,9 @@ def output(self) -> str:
         """Return the text for the stub."""
         imports = ''
         if self._imports:
-            imports += 'from typing import %s\n' % ", ".join(self._imports)
+            imports += 'from typing import %s\n' % ", ".join(sorted(self._imports))
         if self._import_lines:
-            imports += ''.join(self._import_lines)
+            imports += ''.join(sorted(self._import_lines))
         if imports and self._output:
             imports += '\n'
         return imports + ''.join(self._output)