The problem I have with IntelliSense for “Arduino.h” seems to be related to chosen workspace setup.
What works for me now:
- Use a single project e.g. by “open folder” and saved workspace file in same folder
- Use an extra folder for the workspace file, and include projects outside of this folder.
What does not work:
- direct sub-folders of a workspace folder, i.e. workspace file inside this folder, as project folders