Ability to clear current window messages up to "Load more" button

[engelgabriel]

Command (or CTRL) + K clears current window messages up to "Load more" button, which when clicked would retrieve all previous messages. If user re-enters room, messages are loaded as usual.

[marceloschmidt]

It's now enabled. You can press CTRL (or Command) + Shift + K. Shift was added because CTRL+K will move the cursor to the search bar on Google Chrome (Linux and Windows)