When using the find strip with GTK on Linux the "find.close.on.find=0" property is ignored by design. This creates an inconsistency with the win32 builds. It would be if both builds behaved the same as not closing on find is a nice feature to have.
The replace strip does not close on find so the find and the replace strip behave differently under GTK.
I won't be working on this myself.
Implemented in 4.0.0.