fix potential problems with cloning async method call events and impr… #669

Job	Run time
ubuntu-20.04 wxRuby(develop) g++-9 ruby-2.5 wxWidgets-3.2.6(system) SWIG4	26m 1s
ubuntu-22.04 wxRuby(develop) g++ ruby-system wxWidgets-3.2.6(develop) SWIG4	41m 34s
ubuntu-22.04 wxRuby(develop) g++-12 ruby-ruby wxWidgets-3.2.6(system) SWIG4	47m 49s
ubuntu-22.04 wxRuby(gem) g++-12 ruby-3.2 wxWidgets-3.2.6(system) SWIG4	48m 14s
ubuntu-22.04 wxRuby(gem) g++-12 ruby-ruby wxWidgets-3.2.6(embed) SWIG4	48m 27s
ubuntu-22.04 wxRuby(binpkg) g++-12 ruby-ruby wxWidgets-3.2.6(embed) SWIG4	48m 18s
ubuntu-24.04 wxRuby(develop) g++-12 ruby-ruby wxWidgets-3.2.6(develop) SWIG4	29m 24s
ubuntu-24.04 wxRuby(gem) g++ ruby-system wxWidgets-3.2.6(develop) SWIG4	29m 57s
	5h 19m 44s

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