Window stuck in dock
If you turn on "Minimize Windows in to Application Icon" in Dock Preferences, and then minimise the Textastic window, there is no way to get it back! With other apps (e.g. Calculator, Mail) clicking on the app icon de-minimises any docked window, but with Textastic, all that happens is the menu bar comes to the front.
Answer
I can't reproduce the issue. On my machine, windows are maximized when I click on the Dock icon of Textastic with that option enabled.
Which OS X version are you using? I'm on 10.8.5.
Also, I'm not aware that I'm doing anything that should prevent the default behavior from working.
Update: I can reproduce the issue, but it only happens when you have more than one tab open. I'll see what I can do to fix this.
Thanks for looking in to it. I didn't realise it was only with > 1 tab, but just checking here, yes you are correct, 1 tab is fine.
Customer support service by UserEcho
This will be fixed in the next update.