When ninja re-executes cmake due to a modification of e.g. one of the project's CMakeLists.txt the build progress bar does not update properly.

I think this is due ninja correcting the total job count after cmake has run.

e.g. it first reports:
[1/1 ?/sec] Re-running CMake...

and continues the build with e.g.:
[1/916 ?/sec] Building C object ...