show_zero_width_space.py

import sublime_plugin


class ShowZeroWidthSpace(sublime_plugin.EventListener):
    def on_modified_async(self, view):
        spaces = []
        p = 0
        while True:
            s = view.find('\u200b', p + 1)
            if not s:
                break
            spaces.append(s)
            p = s.a

        if spaces:
            view.add_regions("zero-width", spaces, "invalid")
        else:
            view.erase_regions("zero-width")