Switch Default enter behavior and shift enter behaviour

@TestCK There is an extension called HardBreak which will provide you with the functionality you need for Shift + Enter.

To submit on enter, simply implement the editorProps function called handleKeyDown. Tiptap is built on ProseMirror, which uses a sort of hierarchy when it comes to event handler functions. Tiptap has ensured this is the very first handler that is called before any base plugins or extensions. The first value that returns true gets precedence, so only this function actually runs. This means that you are free to run your own onKeyDown event without having an additional paragraph (newline) appended at the end of every message.

(See Access the ProseMirror API and ProseMirror EditorPros Interface for more documentation)

Here is a brief example on CodeSandbox.

@bdbch I did this by adding a custom extension which sole purpose is to add keyboard-shortcut overrides.

Is this the correct approach, or is there a better way to do that

// this is a dummy extension only to create custom keydown behavior
const KeyboardHandler = Extension.create({
    name: 'keyboardHandler',
});

... 

KeyboardShortcutHandler.extend({
    addKeyboardShortcuts() {
        return {
            Enter: () => {
                const isCodeBlockActive = this.editor.isActive('codeBlock');

                if (isCodeBlockActive || ctrlSend) {
                    return false;
                }

                onSubmit();
                return this.editor.commands.clearContent();
            },

            'Mod-Enter': () => {
                const isCodeBlockActive = this.editor.isActive('codeBlock');

                /**
                 * when inside of a codeblock and setting for sending the message with CMD/CTRL-Enter
                 * force calling the `onSubmit` function and clear the editor content
                 */
                if (isCodeBlockActive && codeBlockOnCtrlEnter) {
                    onSubmit();
                    return this.editor.commands.clearContent();
                }

                if (!isCodeBlockActive && ctrlSend) {
                    onSubmit();
                    return this.editor.commands.clearContent();
                }

                return false;
            },

            'Shift-Enter': () => {
                /**
                 * currently we do not have an option to show a soft line break in the posts, so we overwrite
                 * the behavior from tiptap with the default behavior on pressing enter
                 */
                return this.editor.commands.first(({commands}) => [
                    () => commands.newlineInCode(),
                    () => commands.createParagraphNear(),
                    () => commands.liftEmptyBlock(),
                    () => commands.splitBlock(),
                ]);
            },
        };
    },
}),