From 8d3fb714f0842dd05f5d34a9ebea6cc6858ccf0f Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Sat, 20 Jun 2015 18:37:15 -0400
Subject: [PATCH] GtkRange: Make drag gesture less agressive

Moving the mouse while pressing one of the steppers was making
the slider jump to the end, unexpectedly. This was caused by the
drag gesture kicking in when it shouldn't. Fix this by making
all drag gesture signal handlers only do something if we are in
a drag thats started on the slider.

https://bugzilla.gnome.org/show_bug.cgi?id=751050
---
 gtk/gtkrange.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/gtk/gtkrange.c b/gtk/gtkrange.c
index 3ed84343c0..2f7cae5af6 100644
--- a/gtk/gtkrange.c
+++ b/gtk/gtkrange.c
@@ -2286,7 +2286,7 @@ range_grab_remove (GtkRange *range)
 }
 
 static GtkScrollType
-range_get_scroll_for_grab (GtkRange      *range)
+range_get_scroll_for_grab (GtkRange *range)
 {
   GtkRangePrivate *priv = range->priv;
   guint grab_button;
@@ -2397,7 +2397,6 @@ coord_to_value (GtkRange *range,
   value = gtk_adjustment_get_lower (priv->adjustment) + frac * (gtk_adjustment_get_upper (priv->adjustment) -
                                             gtk_adjustment_get_lower (priv->adjustment) -
                                             gtk_adjustment_get_page_size (priv->adjustment));
-
   return value;
 }
 
@@ -2925,15 +2924,18 @@ gtk_range_drag_gesture_update (GtkGestureDrag *gesture,
   GtkRangePrivate *priv = range->priv;
   gdouble start_x, start_y;
 
-  gtk_gesture_drag_get_start_point (gesture, &start_x, &start_y);
-  priv->mouse_x = start_x + offset_x;
-  priv->mouse_y = start_y + offset_y;
-  priv->in_drag = TRUE;
+  if (range->priv->grab_location == MOUSE_SLIDER)
+    {
+      gtk_gesture_drag_get_start_point (gesture, &start_x, &start_y);
+      priv->mouse_x = start_x + offset_x;
+      priv->mouse_y = start_y + offset_y;
+      priv->in_drag = TRUE;
 
-  update_autoscroll_mode (range);
+      update_autoscroll_mode (range);
 
-  if (priv->autoscroll_mode == GTK_SCROLL_NONE)
-    update_slider_position (range, priv->mouse_x, priv->mouse_y);
+      if (priv->autoscroll_mode == GTK_SCROLL_NONE)
+        update_slider_position (range, priv->mouse_x, priv->mouse_y);
+    }
 }
 
 static void
@@ -2952,8 +2954,11 @@ gtk_range_drag_gesture_end (GtkGestureDrag       *gesture,
                             gdouble               offset_y,
                             GtkRange             *range)
 {
-  range->priv->in_drag = FALSE;
-  stop_scrolling (range);
+  if (range->priv->grab_location == MOUSE_SLIDER)
+    {
+      range->priv->in_drag = FALSE;
+      stop_scrolling (range);
+    }
 }
 
 static gboolean