(nsis) Incorrect highlighting of keywords

[idleberg]

Describe the issue

I have identified several cases where the highlighting for NSIS keywords is incorrect:

• keywords should only highlight when at the beginning of the line (with or without leading whitespace)
• keyword blocks should highlight both, the opening and closing keywords

See failing tests for specifics.

Which language seems to have the issue?

NSIS

Are you using highlight or highlightAuto?

Neither. I'm using the Mocha tests.

Expected behavior

Keywords should be highlighted correctly.