[gtk+/wip/baedert/drawing] range: Fix mark positions

[Timm Bäder <baedert src gnome org>]

commit b6cec097c0ed03cac360a7047bce86ec1be5de53
Author: Timm Bäder <mail baedert org>
Date:   Fri Jun 30 13:10:32 2017 +0200

    range: Fix mark positions
    
    The values returned by gtk_range_compute_slider_position are relative
    to the trough_widget (the slider's parent), not the slider widget
    itself.

 gtk/gtkrange.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkrange.c b/gtk/gtkrange.c
index 2c4d208..70220c9 100644
--- a/gtk/gtkrange.c
+++ b/gtk/gtkrange.c
@@ -2910,7 +2910,7 @@ gtk_range_calc_marks (GtkRange *range)
   for (i = 0; i < priv->n_marks; i++)
     {
       gtk_range_compute_slider_position (range, priv->marks[i], &slider);
-      gtk_widget_translate_coordinates (priv->slider_widget, GTK_WIDGET (range),
+      gtk_widget_translate_coordinates (priv->trough_widget, GTK_WIDGET (range),
                                         slider.x, slider.y, &slider.x, &slider.y);
 
       if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)