
Code Minimap (syntax highlighting would be a bonus)
I would love to see a code minimap with syntax highlighting support make its way to Textastic especially for use on my iPad Pro 12.9inch 2nd-gen.
This will bring your app one step closer to desktop counterparts (Atom, Sublime, Visual Studio Code, etc.) and I’m sure will make a lot of power users who wish to stay mobile very happy :)

Edit multiple section of a document simultaneously
Have the ability to select multiple parts of the document and edit it at the same time. Similar to a feature sublime text editor has.

Search and search/replace history
Oftentimes you want to use a previously used regular expression; other times you might have been working on a complex regular expression and want to go back working on it; or perhaps you were searching for specific phrases and the app crashed before you could find what you wanted. For these (and doubtless other) reasons, it would be very useful to have a history on the search and search/replace text fields.

Please add Julia to the list of supported languages
Excellent app, by the way!!

Linked folder
The editor interface is great, but file creation flow for the remote server is too slow. We need to first create a file locally, then edit it, then upload manually onto the server. Why don't just support *Link* for folders? When I download a folder from a server, it should be linked to the remote server and any new files I add into the folder should just be automatically uploaded into the same folder in the server.

How about adding a php runtime just like kodiak?
Add php runtime to allow running php scripts locally. I have kodiak installed on my ipad which does just that. Textastic could benefit.

Full-screen editing mode

iOS 13: Unable to select a folder using “Open File or Folder”
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

Autocomplete based on text in document
Similar to Sublime Text, it would be awesome if when you typed it would suggest/ autocomplete based on other words in the current document.

Ability to edit any file extensions from Files app in iOS11
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.
Customer support service by UserEcho