From a recent discussion with an AwesomeWM contributor, it should be better (maybe performance wise) to not recreate the widget on every hover/activation. Nevertheless, refactoring to this makes the code much simpler due to @undefinedDarkness's widget_structure PR. This will also mean that I have to implement a widget_structure feature for the tag_preview as mentioned in #98 @Nooo37.

• Refractor task_preview
• Refractor and implement widget_structure feature in tag_preview
• Use new awful.screenshot module This module is very buggy.
• Check if anything else needs this refractor