Focus on chat window without toggling

[hoangbn]

Is your feature request related to a problem? Please describe.
Going back and forth between the notes and chat window is not seamless

Describe the solution you'd like
A hotkey to focus on the chat (from wherever), whether the chat is opened already or not

Describe alternatives you've considered
Use the toggle chat functionality, however, it only works well when the chat is already closed. Additionally, it re-indexes

[logancyang]

Dupe of #749 ? @zeroliu

About re-index, you can turn it off in the setting with a different auto index strategy.

[zeroliu]

Yeah, the PR should fix the focus issue. But I also find a bug now that I'm testing it. The settings will reset after triggering the new open chat command. I think it's because we reuse the activate code that disables and re-enables the chat. It causes the settings to reset. I can take this as a follow-up ticket for #749.

[zeroliu]

#845 will be included in the next release. @hoangbn I suggest testing it again with "open window" command once it's live