Implement tabs or separate windows

[Komediruzecki]

The separate windows feature is almost done/implemented
Update the code and/or investigate if everything works fine or implement tabs

[Komediruzecki]

Ported from old issue

Note

This issue is connected with BoostIO/BoostNote-App#344 and BoostIO/BoostNote-App#341.
This issue is for gathering interest and discussion about implementation details of this feature.
Feel free to write your comments and like the issue if it would be helpful for you!

Few questions you can answer:

• Do you miss this feature from boostnote legacy?
• Is it better to have this option as opt-in i.e. editor tabs would take space at the top of the editor, by not using this feature you can have more space, but by using it you can easily navigate between notes (see #700 for navigation improvements)
• Which shortcut would the open new tab be?
• Ability to organize tabs (move them)
• Ability to save opened tabs
• Ability to split two editor views (two tabs): left/right, up/down)

Current behavior

Users cannot view multiple notes at the same time.

Expected behavior

Users should be able to view multiple notes at the same time. Either via opening note in another window or using the editor tabs (like in boostnote legacy)

Steps to reproduce

1. Open boostnote application
2. Try opening two notes and edit/view them simultaneously

Environment

Desktop

• Boost Note.next version: 0.12.3
• OS version and name: Windows/Mac/Linux