While testing over VNC on RHEL7.6.z and gnome-settings-daemon-3.28.1-3.el7_6, I do not see this issue fixed and it introduced other problems. The OSK doesn't pop up when you try using it in apps like gedit, terminal etc. There is another issue I cannot reproduce all the time but with the OSK enabled, I am unable to type using the physical keyboard into gedit or terminal. It spits out gibberish in the terminal and nothing in gedit, I will attach a pic.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2019:2849