[REQUEST] Highlight priority

[lumynou5]

Is there an existing issue for this?

• I have searched the existing issues

This feature does not exist in the latest nightly version

• I have checked the latest nightly version

Feature Description

It seems the current implementation depends on the insertion order of highlight rules (#1054). This might be unwanted because it's hard to configure exact rules to apply. Two possible designs are

• Always apply most strict rule. For example, if a message matches the conditions "from a moderator" (badge) and "from a certain user" (username), the username rule is applied due to its narrower range. It's easy to users and is the desired behavior usually but with limitation e.g. reply is wider than username but reply can be considered more important.
• Allow users to decide the priority of each rule. We still need to decide how to handle edge cases such as multiple rules with same priority.

I'm willing to make a patch for this, but I think we should discuss the design before implementation.