postFrameCallbackStandardDelay constant Null safety
If the camera is being closed (when stoppingCamera == true) and this Widget is visible again, we add a post frame callback to detect if the Widget is still visible
If the time took by the "post frame callback" is less than this duration, we considered, that the camera should be reinitialized
On a 60Hz display, one frame =~ 16 ms => 100 ms =~ 6 frames.
Implementation
static const int postFrameCallbackStandardDelay = 100;