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Strange underlining in the editor

Some symbols are underlined with a single grey line. They're not errors. I can't find a setting which relates to these. Does anyone know what they are and how to remove them?

drive.google.com/open

Which ones are underlined is consistent but I can't work out what causes it.

If I just enter a lot of single characters, the following ones are underlined:

b w C N T V Z

And various other symbols, can't work out the rhyme or reason

NVIC_SystemReset

is underlined, but

HAL_NVIC_SetPriority

is not...

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