On iOS 13 you can no longer select external folders in the standard  UIDocumentPickerViewController. 

My proposed fix

1. Separate the “Open file or folder” button into an “Open file” button and “Open folder” button

2. Do not do anything with the “Open file” button. Everything works fine already.

3. When user taps “Open folder” button, present a document picker initialized with 

UIDocumentPickerViewController(documentTypes: [kUTTypeFolder as String],
                                   in: .open)

BTW, there’s actually a tutorial from Apple about providing access to directories here

Similar to Sublime text, it would be awesome to have an option highlight the current line of which the cursor is on (color would be based on the theme) 

a lot of file extensions are not associated or having the option to open them with textastic app using Files/iCloud/OneDrive/etc..

Please add the ability to edit any text based file extension from there. 

When I add a new FTP I'd like to be able to use 1Password.

Scenario

Right now I am learning XML and trying to create a schema for Balsamiq (unofficial schema for my workflow), but I have to fire up VS 2012 RTM on my laptop and I need to constantly flip between a schema that works with intellisense and one that still has issues, not to mention having a tutorial page open to learn the specs.  As I have described, you can imagine I have limited visibility of either schema, which means I need to constantly adjust the size of the window panes.  This has another problem, there is no scrolling synch (unlike Word 2007-2013), which makes it extremely difficult to spot differences.

Why do I still use this method?

Intellisense is the reason, being allowed to reference known Schemas makes my job a little easier.

Suggestion

1.  Add ability to reference Schemas, so that autocomplete works with XML and other XML related languages (XAML, YAML, XSL, XSLT, etc).

2.  Add ability to store custom Schemas and reference them with other Schemas.

3.  Implement a synchronized scrolling feature that allows users to spot differences between 2 documents (similar to the Notepad++ diff plugin or Word 2010 if you want to wait to add diff).

(feature request copied from an email by Jon Edlund)

The JavaScript support is already great, but help with the jQuery functions would be a big time-saver as well.