Currently Tab accepts the selected code completion (same as Return). 

I could probably add a setting so that you can configure whether Tab accepts or selects the next completion. 

I don't think I want to make this into a fully configurable keyboard shortcut.

What should happen if there is only one completion in the list? Should Tab do nothing or accept the completion?

This is now fixed in Textastic 10.9.5.

This is now fixed in Textastic 10.9.5.

Thanks for confirming!

This is fixed in Textastic 10.9.5.

Hello,

use View -> Show Sidebar. Then click the "Add Folder…" button in the sidebar.

Alternatively, use File -> Open (Cmd-O), navigate to a folder and click Open.