[gtk+] textview: Only trigger drag gesture on GDK_BUTTON_PRIMARY

[Carlos Garnacho <carlosg src gnome org>]

commit 995b6d1fd4350f845b002b0929db549a8f1f4499
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sat May 31 14:54:32 2014 +0200

    textview: Only trigger drag gesture on GDK_BUTTON_PRIMARY
    
    This gesture was only meant to react on GDK_BUTTON_PRIMARY (either
    through real pointer events, or implicitly assumed from touch events),
    as it used to behave before gestures. Otherwise the gtk_drag_begin*()
    call assumes being triggered by button 1, and the drag misbehaves
    because that button isn't really in the state mask.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=731016

 gtk/gtktextview.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtktextview.c b/gtk/gtktextview.c
index a66e5f2..f06665e 100644
--- a/gtk/gtktextview.c
+++ b/gtk/gtktextview.c
@@ -1564,6 +1564,8 @@ gtk_text_view_init (GtkTextView *text_view)
   priv->drag_gesture = gtk_gesture_drag_new (widget);
   gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->drag_gesture),
                                      FALSE);
+  gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (priv->drag_gesture),
+                                 GDK_BUTTON_PRIMARY);
   gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->drag_gesture),
                                               GTK_PHASE_BUBBLE);
   g_signal_connect (priv->drag_gesture, "drag-update",