*** Hello everyone, I’m working with Kdevelop 5.12.230805. As soon as I hover the mouse over for example "cout" in the editor, the documentation for “cout” appears in a window. The same works for "string", for example. But not for other keywords such as "while", "return", "char", etc. However, the file cppreference-doc-en-cpp.qch is located in /usr/share/qt5/doc/, as are all other Qt-related files. Solution? Tnx for an answer!
"cout" and "string" are not keywords but standard library functions. Language keywords are never highlighted in KDevelop (and probably not in other IDEs either).