How to type C-M?
Particularly, I am after this command -
from https://www.gnu.org/software/emacs/manual/html_node/emacs/Indentation-Commands.html
First attempt
- Select the text
- Use the combination Ctrl-Alt and Ctrl-Alt GR but I don't see any effect.
Second attempt
By asking a key description (type C-h k followed by the relevant key combination) I really get the correct reference:
but why I don't see any indentation?
C-h k
emacs should prompt you in the minibuffer with "Describe the following key". If you then try typingC-M-\
again, what does Emacs tell you?