I noted, that clang code model plug-in in newer versions of Qt Creator makes highlighting and code suggestions in Blender code in Qt Creator completely unusable.

So, I suggest add information how to disable it here https://wiki.blender.org/wiki/Developer_Intro/Environment/Linux_CMake_QtCreator

Go into Help->About Plugins and uncheck the Clang code model plugin. You have to restart qt creator after that to make it take effect.

https://stackoverflow.com/questions/51662932/qt-how-do-i-remove-clang-code-model