Support multi-tab

[bagustris]

It is a common feature that a (note) editor should have a multi-tab feature, i.e., to edit multiple notes simultaneously.

What

Support multi-tab for Simplenote

Why

Editing multiple notes is a common workflow (e.g., for linking or remembering other topics when editing another). Considering the following work flow:

• edit note A
• edit note B, leaving note A
• back to note A

How

Open each note in each tab, provide close (x) symbol in each tab to close that tab.

[codebykat]

I understand that you're asking for tabs within the app, but I think if we added distinct URLs for notes, that would largely address this use-case. #1635

[codebykat]

Closing for now, with the suggestion that you use https://app.simplenote.com in a browser, which should allow you to use browser tabs to simultaneously edit multiple notes to your heart's content.