use more efficient form of signal_connect
for mouse handlers
#56
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This is another cleanup from the Gtk4 port. I had used the user friendly, less efficient version of
signal_connect
to set up the mouse event handlers. This uses the faster compiled version, which was done in the Gtk.jl version. It allocates less and is slightly faster when callingimshow
in ImageView.Also:
Fixes #57
Fixes #58