Methods mysteriously highlighted in Red

Anyone know what this means? See attached. My first guess is it means something is deprecated, but I changed that function and the method is still red.
Screen Shot 2021-05-11 at 12.14.54 PM

I have also encountered a yellow highlight as well in other contexts.

Red = Private
Yellow = Protected
image

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And you can change that appearance under Preferences / Navigator to a small dot:

It then looks like this:

Screenshot 2021-05-11 at 18.41.52

“Behind item text” is the setting you currently have.

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