[gtk+/gtk-3-22] progresstracker: Don't hand out NaN

[Benjamin Otte <otte src gnome org>]

commit efaa6524acf8a605c0c28d2883afe97f5ac9dc6e
Author: Benjamin Otte <otte redhat com>
Date:   Sun Nov 12 06:19:00 2017 +0100

    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.

 gtk/gtkprogresstracker.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkprogresstracker.c b/gtk/gtkprogresstracker.c
index c1d3f44..7f7e7d7 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;
 }