"end" keywords for highlighting should not be tracked within blocks or words

[pascal456]

The end keyword will be highlighted in the special case when there is either ( or ) before the colon :. The colon is indeed valid

Example:

sequenceDiagram
    loop do magic
        Participant1-->Backend (with brackets): wrong highlighting on this line
    end
    loop do magic
        Backend-->Backend: highlighting is fine on this line
    end

which results to:

sequenceDiagram
    loop do magic
        Participant1-->Backend (with brackets): wrong highlighting on this line
    end
    loop do magic
        Backend-->Backend: highlighting is fine on this line
    end