showForm: keep alpha for ARGB cursors
showForm: keep alpha for ARGB cursors

fniephaus/SqueakJS,fniephaus/SqueakJS,sebastianconcept/SqueakJS,Speed-Pad/online,fmateoc/SqueakJS,the-impossible-quiz-revisited/the-impossible-quiz-revisited.github.io,bertfreudenberg/SqueakJS,Speed-Pad/online,Speed-Pad/online,sebastianconcept/SqueakJS,the-impossible-quiz-revisited/the-impossible-quiz-revisited.github.io,the-impossible-quiz-revisited/the-impossible-quiz-revisited.github.io,bertfreudenberg/SqueakJS,fmateoc/SqueakJS,bertfreudenberg/SqueakJS,fniephaus/SqueakJS,fniephaus/SqueakJS,sebastianconcept/SqueakJS,fmateoc/SqueakJS,fmateoc/SqueakJS,the-impossible-quiz-revisited/the-impossible-quiz-revisited.github.io,bertfreudenberg/SqueakJS