Description Dirk Wiesenthal 2013-09-20 10:24:51 CEST

Reason is the "indeterminate" value of the progressbar during software tests and the "0" value when the installation begins. There is a transition effect that goes from 100 to 0 and lasts just long enough for users to wonder why the progress goes in the wrong direction.

The transition is a CSS effect. Remove this effect by watch(progressbar, 'indeterminate') and (un)set a class:

.noTransition {
  -webkit-transition-property: none;
  -moz-transition-property: none
  transition-property: none;
  -webkit-transition-duration: 0;
  -moz-transition-duration: 0;
  transition-duration: 0;
}

This problem is App Center specific (because indeterminate is used only there) but should be fixed generically in umc/widgets/ProgressBar.