progresstracker: Don't hand out NaN

When the duration is set to 0, clamp it to 1us. This way we're almost
correct: We should really instantly finish, but we don't. But we do
respect the delay.

Doing this properly would require some refactoring of how the progress
tracker actually maintains progress, and this is just a quick fix.

1 files changed, 3 insertions, 3 deletions

diff --git a/gtk/gtkprogresstracker.c b/gtk/gtkprogresstracker.c
index 81cca35d19..0ddcbfbe4c 100644
--- a/gtk/gtkprogresstracker.c
+++ b/gtk/gtkprogresstracker.c
@@ -82,7 +82,7 @@ gtk_progress_tracker_start (GtkProgressTracker *tracker,
   tracker->is_running = TRUE;
   tracker->last_frame_time = 0;
   tracker->duration = duration;
-  tracker->iteration = - delay / (gdouble) duration;
+  tracker->iteration = - delay / (gdouble) MAX (duration, 1);
   tracker->iteration_count = iteration_count;
 }
 
@@ -108,7 +108,7 @@ gtk_progress_tracker_finish (GtkProgressTracker *tracker)
  **/
 void
 gtk_progress_tracker_advance_frame (GtkProgressTracker *tracker,
-                                 guint64 frame_time)
+                                    guint64             frame_time)
 {
   gdouble delta;
 
@@ -127,7 +127,7 @@ gtk_progress_tracker_advance_frame (GtkProgressTracker *tracker,
       return;
     }
 
-  delta = (frame_time - tracker->last_frame_time) / gtk_slowdown / tracker->duration;
+  delta = (frame_time - tracker->last_frame_time) / gtk_slowdown / MAX (tracker->duration, 1);
   tracker->last_frame_time = frame_time;
   tracker->iteration += delta;
 }