search cannot find strings which include a hard line break - table cells, list items, etc.

this is a real hindrance

I am not able to open a .mq4 Text file in Textastic.

It is just a simple text code file. Should work easily.

add a recent directories menu over the directories column, similar to the recent files menu over the editing window

There seems to be no support for Python 3 (released in 2008) type hints. From what I gather you are using the TextMate Python package for code highlighting, a somewhat more up-to-date highlighting package that most all other editors use (Sublime, Microsoft Code, Atom, GitHub) is MagicPython: https://github.com/MagicStack/MagicPython which has much better support for Python 3.

It would be wonderful to be able to select a size or device size when viewing files on iPad so that true mobile testing can take place.  

Perhaps a few select sizes, such as mobile, tablet, and desktop to begin, or perhaps a width and height control for viewing how Media Queries are behaving?

Thank you for taking this into consideration....and I could never tire of thanking you for the wonderful app you have provided.  I really enjoy using it and feel very confident developing website solely on my iPad Pro.  

This option is not working on my macbook pro macOS Sierra

Everytime I open Textastic this window is shown.

The mainfame editor, ISPF, provides the capability to display a document based upon the position of the cursor: Relative to the line on which the cursor appears, the line of the document is positioned to the top, middle, or bottom of the screen. EMACS and Vim also enable this functionality via "Line to Top", "Line to Middle", etc. 

Please consider the possibility to include this functionality to facilitate program development and text editing by displaying portions of the document relative to position of the cursor.