When i change focus to other application, Textastic hide it windows.

Can you maybe tell me step-by-step what I have to do to reproduce the issue?

I don't see such a behavior on my machines.

Another user just reported this problem when the code completion list is showing:

"When you have a code suggestion show with examples of what to write and you haven't hit enter or dismissed the suggestions, and then change application, the window disappears and only reappears when you change back to Textastic."

I'll try to fix this in an update.