Live-preview on-canvas still needs to create (and remove again) the clones (actual objects), so live-preview needs to be 'cancel-able' with immediate effect, otherwise this could cause unwelcome hangs, especially if the targeted 'new' users toggle the button on/off quickly because they might not get an immediate preview (e.g. due to the complexity based on the chosen parameters).
To be kept in mind: /bugs.launchpad .net/inkscape/ +bug/170745
* Bug #170745 (sf1214905) “cancel button for tile cloning”
https:/
Live-preview on-canvas still needs to create (and remove again) the clones (actual objects), so live-preview needs to be 'cancel-able' with immediate effect, otherwise this could cause unwelcome hangs, especially if the targeted 'new' users toggle the button on/off quickly because they might not get an immediate preview (e.g. due to the complexity based on the chosen parameters).