**Steps to reproduce**
1. Create (or choose) a category.
2. Ensure 'Group results by page' is **not** selected.
{F58596169}
3. Add a page to the category from step 1.
4. On Special:RecentChanges, select the 'Category changes' filter, and look at the entry for the page addition - `diff` and `hist` will not be linked.
If 'Group results by page' //is// selected, the `diff` and `hist` links are linked.
**Original description**
Hi. Something strange. I allways use grouping mode for watchlist and recent changes in preferences. Today I removed it for a couple of minutes to check something, and saw that all categorigation entries do not have diff links. The words "( diff | history )" are just a plain text, without links. As I know it works well in grouping mode, so I'd like to understand: Was it done in purpose? Thank you.