Tap on object handle or time slider should animate or change frame and double-tap should open context menu

[rc-davis]

Press to hold is sometimes very difficult to use. We should use double-tap to open context menus. Here are a set of changes that i hope will give our users a clear and easily remembered mental model:

Object Handle

• Tap to enter or exit animate mode (no change)
• Double tap to open context menu

Time Slider

• Tap to show magnifier plus nudge left/right arrows. (Tap anywhere else to make it disappear.)
• Double-tap to show context menu. Left/right arrows now move the key frame, and not just the slider. (Tap anywhere else to make it disappear.)