Request: Allow new auto-call option "on release"

[jni]

Some functions are too slow to compute on each slider increment, but one still wants to be able to move a slider and trigger a computation on release, rather than have to go to a "calculate" button each time. One implementation idea is to have three settings for auto-call: True/on-value-change, on-release, False. Whether this is done with an enum, a union of an enum/bool, or something else... 🤷

xref scikit-image/skimage-tutorials#55

[imagesc-bot]

This issue has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/how-can-a-napari-plugin-function-know-which-time-point-is-selected-in-the-selected-image-layer/54681/7