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 61e6f63123033b0faafa73121199f61dd303abfa..c5f76b0da4e1ffc37ab016b54377c9e14267ec3a 100644 (file)
--- a/gtk/gtktextview.c
+++ b/gtk/gtktextview.c
@@ -8392,9 +8392,6 @@ 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,
@@ -8454,8 +8451,11 @@ 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)
   {