Input: Add Control+PageUp/Control+PageDown to switch between open files

[bryphe]

Feedback from discord - we should add Control+PageUp / Control+PageDown as default bindings for switching between opened files.

Is this the same default on OSX?

[dereknelson]

I personally would prefer cmd+shift+[ / cmd+shift+] to move left and right, this behavior is shared with chrome and discord

[bryphe]

@jordwalke mentioned the same request on Discord - have cmd+shift+[ switch between tabs.

[paskausks]

In case of discord, I use ctrl+alt+arrow up / ctrl+alt+arrow up to switch servers, but for firefox/chrome I'm, personally in the ctrl+pgup / ctrl+pgdn crowd, so, personally, I'm for that as default, instead of ctrl+shift+[ / ctrl+shift+].

[jamesgecko]

ctrl+pgup / ctrl+pgdown is a Windows shortcut. The macOS convention for switching tabs is cmd+shift+[ / cmd+shift+]. Ideally both would work; Firefox supports both keybindings on macOS.

[leavengood]

I have this working, with both shortcuts, I will open a PR today.