No cursor blink in GTK3 gvim

[Tony Mechelynck]

In GTK3 gvim (Huge), my 'guicursor' option is set to the default, and
the cursor doesn't blink. I don't know how long this has been the
case. The help for 'guicursor' says that blinking is enabled by
default.

In Firefox-nightly 155.0a1, which according to its "about:buildconfig"
page (at bottom) is also built with GTK3, the cursor blinks a few
times after I move it then stops blinking.

In gvim (Normal) with Motif and the same (default) 'guicursor' the
cursor blinks as expected.

All my Vim executables are at the moment at patchlevel 9.2.933, built
with gcc 10.1.1 on openSUSE Tumbleweed.

Best regards,
Tony.