Mcc_ActionTextEditor

ActionTextEditor.mcc is a MUI custom class that subclasses TextEditor.mcc.
Pressing Return with text in the gadget calls a hook you supply with
MUIA_ActionTextEditor_SubmitHook. Right Shift + Return inserts a newline
instead, the same as TextEditor.mcc.

It was written for AmigaGPT and is published so other MUI programs can use
the same Return-to-submit behaviour.

MCC_TextEditor 15.56 or later MUST be installed before this class will
load. Download it from:
https://aminet.net/dev/mui/MCC_TextEditor-15.56.lha

Requirements:
- MUI 3 or later
- MCC_TextEditor 15.56 or later installed
  (https://aminet.net/dev/mui/MCC_TextEditor-15.56.lha)
- AmigaOS 3.1+ with a 68020 or higher, AmigaOS 4.1, or MorphOS

Installation:
- Extract MCC_ActionTextEditor.lha
- Run Install-MCC_ActionTextEditor
- The installer copies ActionTextEditor.mcc to MUI:Libs/MUI on AmigaOS
  or SYS:Classes/MUI on MorphOS
- Reboot or restart MUI applications that should pick up the class

Developer:
- include/mui/ActionTextEditor_mcc.h is in the Developer drawer
- Autodocs/MCC_ActionTextEditor.doc is in Developer/Autodocs
- Class name: ActionTextEditor.mcc
- Attribute: MUIA_ActionTextEditor_SubmitHook

Source:
https://github.com/sacredbanana/MCC_ActionTextEditor