Visual Studio Shortcuts: Collapsing and Expanding text

OK, here are some shortcuts I recently rediscovered. These are in response to me suddenly finding a lot of code collapsed in Visual Studio so only the definitions were visible.

All of these shortcuts are found in the Visual Studio menu Edit->Outlining

Ctrl-M, Ctrl-M: Toggle Outlining Expansion
This one is useful if you have a single function you want to view or hide
Ctrl-M, Ctrl-L: Toggle All Outlining Expansion
Use this to view or hide an entire file
Ctrl-M, Ctrl-O: Collapse to Definitions