I tried to run the current Cppcheck tool also on header files which
resulted in some errors because Cppcheck thought it was a C file.
In the new version of the Cppcheck tool "Cppcheck (C++ only)" the
parameter --language=c++ is set explicitly and header files are included
in the file filter.
With this setting more results were generated, e.g. in katemainwindow.h
several methods were marked as "not used", e.g. closeSplitView, which I
removed with this commit. The code still compiles fine though I am not
sure if the function is maybe supposed to be used from some external
project.
**I find the following strange:** if Cppcheck is only run on cpp files, it
still reports some issues in header files. But not as much as when I
explicitly feed it with the header files.