As in subject. I tested on cpp and xml file. The same result. Tested on Antergos (up-to-date) and KaOS (up-to-date) Other components: Qt 5.10, Plasma 5.11.4, KF 5.41, KApplications 17.12
Documents are not expected to be syntax-highlighted. The only thing that is syntax-highlighted at all in Kompare is the text view of the diff, which uses the highlighting for diffs (i.e., it also does not highlight the syntax of the compared documents). The parts that are all gray are the parts that did not change. They are intentionally grayed out in order to highlight the parts that did change.
It's sad what are you saying. In my opinion missing this function strongly decrease readability of compared documents. Saying documents I mean files contain source code. I suppose you meant the same saying: "Documents are not expected to be syntax-highlighted" or correct me if I'm wrong. Since several years I was hope that this usability will appear some day, but I see that no chance - if you are saying: "Documents are not expected to be syntax-highlighted".
I could reopen this and mark it as a wishlist item, but I don't think this feature is going to be implemented any time soon either way. It is not a bug in any case.
OK. After you explanation I understood this is not the bug. If this feature will be not be implemented then may I know what is planed to be implemented soon? I mean is there any list of features? And yes, please reopen and change as a "wishlist item". Thanks in advance.