Forward-merge from 3.4.
diff --git a/.hgtags b/.hgtags
index c75eb7c..ad14c02 100644
--- a/.hgtags
+++ b/.hgtags
@@ -148,6 +148,7 @@
 737efcadf5a678b184e0fa431aae11276bf06648 v3.4.4
 3631bb4a2490292ebf81d3e947ae36da145da564 v3.4.5rc1
 619b61e505d0e2ccc8516b366e4ddd1971b46a6f v3.4.5
+e199a272ccdac5a8c073d4690f60c13e0b6d86b0 v3.4.6rc1
 5d4b6a57d5fd7564bf73f3db0e46fe5eeb00bcd8 v3.5.0a1
 0337bd7ebcb6559d69679bc7025059ad1ce4f432 v3.5.0a2
 82656e28b5e5c4ae48d8dd8b5f0d7968908a82b6 v3.5.0a3