Messages which are deleted while loading the preview will get a opacity of 50% to make clear that this is not relevant.
How can I get it?
- Install Greasemonkey (for Firefox) or Tampermonkey (for Chrome)
- Install the user script by clicking here or install the development version which will been updated more often (theoretically).
- Add option to mark a message as spam from the chat.
- Hide preview when a user send a gone message.
How does it look?