textview: fix bug on DnD displaced limits of selection

The fix of commit f2fd655754407103f8fb9b2c3e7586fb595ab917
should be confined to DnD coords only, because otherwise
it causes the start and end of the selection to be displaced.

https://bugzilla.gnome.org/show_bug.cgi?id=785736

diff --git a/gtk/gtktextview.c b/gtk/gtktextview.c
index e624d2703dc78fa3e696fa9e336dd5df2d7e681b..0b8197560687e2643820053ba03ca12ed721ea59 100644 (file)
--- a/gtk/gtktextview.c
+++ b/gtk/gtktextview.c
@@ -8265,9 +8265,6 @@ gtk_text_view_drag_motion (GtkWidget        *widget,
       y > (target_rect.y + target_rect.height))
     return FALSE; /* outside the text window, allow parent widgets to handle event */
 
-  x -= target_rect.x;
-  y -= target_rect.y;
-
   gtk_text_view_window_to_buffer_coords (text_view,
                                          GTK_TEXT_WINDOW_WIDGET,
                                          x, y,
@@ -8327,8 +8324,11 @@ gtk_text_view_drag_motion (GtkWidget        *widget,
       gtk_text_mark_set_visible (priv->dnd_mark, FALSE);
     }
 
-  priv->dnd_x = x;
-  priv->dnd_y = y;
+  /* DnD uses text window coords, so subtract extra widget
+   * coords that happen e.g. when displaying line numbers.
+   */
+  priv->dnd_x = x - target_rect.x;
+  priv->dnd_y = y - target_rect.y;
 
   if (!priv->scroll_timeout)
   {