I just tried this and was able to reproduce the issue. I discovered that if you open the same .axml file again with the Automatic Editor Selector (XML), leaving the one opened with the default Android Layout File editor open as well, then the comment/uncomment buttons work as expected. You can even close the Automatic Editor Selector (XML) document one the comment buttons are enabled for your Android Layout File document instance. I.e:
Answers
@GlennErler
I just tried this and was able to reproduce the issue. I discovered that if you open the same .axml file again with the Automatic Editor Selector (XML), leaving the one opened with the default Android Layout File editor open as well, then the comment/uncomment buttons work as expected. You can even close the Automatic Editor Selector (XML) document one the comment buttons are enabled for your Android Layout File document instance. I.e:
Thanks for the investigative work!!! Comments are working again.
Glad to hear it. I filed an internal bug report to address this.