Thanks for the fix, Reimund. I have merged the fix into our VSTGUI 4.3.1 code base. I had to tweak it a little bit to fix returning the keyboard focus after editing a textedit control and pressing enter.
Now I encounter the problem that in all hosts I have tested so far, pressing the arrow keys does not yield a WM_KEYDOWN event. The event is always caught by the host. Does anyone encounter a similar problem? Again, we are not using the latest VSTGUI version from the master branch, but the latest released version.