IDE v2.1.0 highlighting

I use a lot of mcu with Arduino IDE. In terms of compatibility of hardware add-ons, I don't use v2.x.x, but I often try to see where the process has changed.

_delay_ms(x), delay_ms(х), delay(х) - each is in place and lights up normally in v1.8.9, but I see no response in v2.1.0. This is useful! It's missing on v2.1.0.

And does it have a function/doesn't it in program, is there a void ... in front, it lights up red. Why?
(sorry for my english, it's with a g. translator)



When using the light theme, the highlight is very faint. I use the dark theme and see

image

Put another letter in front. Function will be wrong, but highlight again.
etc.
wwwwdelay_ms(1000);

in v2.1.0
Untitled-3

in v1.8.19 all OK
(we not have function wwwwdelay_ms();, it is normal that is not highlight):
Untitled-4

Try complying it then see if the color changes to light red.

Let's try to get it clear. Are you talking about syntax highlighting or about error highlighting?

My screenshot was about error highlighting.

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