fix: diag_fmt fallback logic, revert early formatter check

[xiaoshihou514]

No description provided.

[glepnir]

emm this will cause a ignore pattern buffer still have BufWritePre event reigseter . this is not correct.

[xiaoshihou514]

emm this will cause a ignore pattern buffer still have BufWritePre event reigseter . this is not correct.

The previous logic would not attatch if any of the formatters ignored this buffer, which is not correct either.

[glepnir]

previous logic does not register this event for buffer 2. but now registered

[xiaoshihou514]

previous logic does not register this event for buffer 2. but now registered

Yes, I removed that logic because it was incorrect.

[glepnir]

reason ?????? this is a bug which cause the server can not sync with increment

I got what you mean