Not possible to create filter rules with negative conditions (does *not* contain, etc.)

[jancborchardt]

Is your feature request related to a problem? Please describe.

Most of my filters include a negative condition, e.g.:

• Messages not having specific people in the "to" field
• Messages with specific words in the title except if from specific people

Currently it is only possible to compare with "positive" conditions like:

• is
• contains
• matches

Describe the solution you'd like

The conditions comparator could be expanded to:

• is
• is not
• contains
• does not contain
• matches
• does not match

Describe alternatives you've considered

No response

Additional context

No response