On macOS 26 Tahoe, adding the help button causes the caption of the OSK
to overlap the window controls, preventing the OSK from being closed.
Disabling the help button is a stop-gap workaround; the help is still
available from the Configuration window. This should be considered for
re-engineering in 19.0 beta or 20.0 alpha.
Not marking the issue as fixed but allows us to postpone deeper
engineering.
Relates-to: #16571
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