Mattermost-server: Desktop: Keyboard shortcut to go directly to the search bar with the in: channel search modifier pre-filled

[mattermod]

Functional Notes
Using the following shortcuts to take your focus to our in app search bar, and popular the search bar with the “:in” identifier for the current channel, followed by a trailing space.
So in the case of the screenshot attached, hitting the keyboard shortcut would add the following into the text input field with the cursor placed after the last space: "in:core features "

Web app (Browser)
Cmd+Shift+F for Mac
Ctrl+Shift+F for Windows

Desktop App
Cmd+F for Mac
Ctrl+F for Windows

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JIRA: https://mattermost.atlassian.net/browse/MM-19327

[MathewtheCoder]

I am interested in working on this issue. @esethna

[esethna]

Awesome, thanks @MathewtheCoder! You may also want to pick up this related ticket after completing this one if you're interested :)

[MathewtheCoder]

@esethna I have created a PR for this issue. Please check when you have time and give comments on it.
For the private messages i am currently not doing any pre-fill since it was not specified what to do in this scenario.