Eclipse does not highlight matching variables

Question

Eclipse does not highlight matching variables for me:

I\'ve already tr

Answer 1

I wish I could have read the response by @Ján Lazár.

In addition to all the configurations mentioned in the accepted answer, below setting solved my misery:

For large files the scalability mode must be turned off. Enabling scalability mode will disable reference highlighting.

PS: @Rob Hruska It would be great if this point is added in the accepted answer. Most of the readers do not bother to read the last response.