Set default direction to RTL

I think it’s better to have an option to set default direction of editor to RTL.

This would be handy, but you can do the same by initializing the editor and set the text direction and alignment:

var node = document.getElementById('editor');
var editor = new Quill(node, { theme: 'snow' });

editor.format('direction', 'rtl');
editor.format('align', 'right');

Also I saw the generated code of editor and it set’s a class for every node (ql-align-right ql-direction-rtl), this causes adding unneeded classes to text.

Quill works with the Delta format, which can be read back and formatted as you wish. It is not supposed to output compatible html. If you need to tweak html output, you need to tinker with Parchment. See some examples here.

.ql-editor {
  direction: rtl;
  text-align: right;
}

we want to make it rtl initially and also make it selectable (changeable), but with your idea it will be locked in rtl direction and the direction option in toolbar will be useless …