Add space between individual transform components in svg output.

Test e.g. with
`figtext(.5, .5, "hello", rotation=45); savefig("test.svg")`

See discussion at
https://gitlab.com/inkscape/inkscape/-/issues/1058#note_296145942

Author: anntzer

lib/matplotlib/backends/backend_svg.py

@@ -3,7 +3,7 @@
 import datetime
 import gzip
 import hashlib
-from io import BytesIO, StringIO
+from io import BytesIO
 import itertools
 import logging
 import os
@@ -248,17 +248,17 @@ def flush(self):
 
 
 def _generate_transform(transform_list):
-    output = StringIO()
+    parts = []
     for type, value in transform_list:
         if (type == 'scale' and (value == (1,) or value == (1, 1))
                 or type == 'translate' and value == (0, 0)
                 or type == 'rotate' and value == (0,)):
             continue
         if type == 'matrix' and isinstance(value, Affine2DBase):
             value = value.to_values()
-        output.write('%s(%s)' % (
+        parts.append('%s(%s)' % (
             type, ' '.join(short_float_fmt(x) for x in value)))
-    return output.getvalue()
+    return ' '.join(parts)
 
 
 @_api.deprecated("3.6")