[gnome-todo/wip/gbsneto/subtasks] task-list-view: simplify the drag-motion code

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 51bb3a6faca77747e91e48893380025331a6b157
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Sat Oct 15 12:44:49 2016 -0300

    task-list-view: simplify the drag-motion code

 src/gtd-task-list-view.c |   25 ++++++++++---------------
 src/gtd-task-row.c       |   22 ----------------------
 src/gtd-task-row.h       |    3 ---
 3 files changed, 10 insertions(+), 40 deletions(-)
---
diff --git a/src/gtd-task-list-view.c b/src/gtd-task-list-view.c
index 5a7bfe2..abf9c30 100644
--- a/src/gtd-task-list-view.c
+++ b/src/gtd-task-list-view.c
@@ -1088,22 +1088,14 @@ gtd_task_list_view_drag_motion (GtkWidget      *widget,
    */
   if (!hovered_row)
     {
-      gtd_dnd_row_set_row_above (GTD_DND_ROW (priv->dnd_row), NULL);
       gtk_widget_hide (priv->dnd_row);
+      gtd_dnd_row_set_row_above (GTD_DND_ROW (priv->dnd_row), NULL);
 
-      gdk_drag_status (context, GDK_ACTION_COPY, time);
-      return TRUE;
-    }
-
-  task_row = GTD_TASK_ROW (hovered_row);
-
-  if (!gtd_task_row_is_drag_valid (task_row, context))
-    {
-      gdk_drag_status (context, 0, time);
-      return FALSE;
+      goto success;
     }
 
   row_above_dnd = NULL;
+  task_row = GTD_TASK_ROW (hovered_row);
   row_height = gtk_widget_get_allocated_height (GTK_WIDGET (hovered_row));
   gtk_widget_translate_coordinates (widget,
                                     GTK_WIDGET (hovered_row),
@@ -1165,11 +1157,10 @@ gtd_task_list_view_drag_motion (GtkWidget      *widget,
       /* Forbid DnD'ing a row into a subtask */
       if (row_above_task && gtd_task_is_subtask (dnd_task, row_above_task))
         {
-          gtd_dnd_row_set_row_above (GTD_DND_ROW (priv->dnd_row), NULL);
           gtk_widget_hide (priv->dnd_row);
+          gtd_dnd_row_set_row_above (GTD_DND_ROW (priv->dnd_row), NULL);
 
-          gdk_drag_status (context, 0, time);
-          return FALSE;
+          goto fail;
         }
 
     }
@@ -1190,9 +1181,13 @@ gtd_task_list_view_drag_motion (GtkWidget      *widget,
                            y,
                            time);
 
+success:
   gdk_drag_status (context, GDK_ACTION_COPY, time);
-
   return TRUE;
+
+fail:
+  gdk_drag_status (context, 0, time);
+  return FALSE;
 }
 
 static gboolean
diff --git a/src/gtd-task-row.c b/src/gtd-task-row.c
index 2b0f7b3..2903743 100644
--- a/src/gtd-task-row.c
+++ b/src/gtd-task-row.c
@@ -922,28 +922,6 @@ gtd_task_row_destroy (GtdTaskRow *self)
 }
 
 gboolean
-gtd_task_row_is_drag_valid (GtdTaskRow     *self,
-                            GdkDragContext *context)
-{
-  GtdTaskRow *row;
-  GtkWidget *source_widget;
-  GtdTask *row_task, *target_task;
-
-  source_widget = gtk_drag_get_source_widget (context);
-
-  if (!source_widget)
-    return FALSE;
-
-  row = GTD_TASK_ROW (gtk_widget_get_ancestor (source_widget, GTD_TYPE_TASK_ROW));
-
-  /* Do not allow dropping on itself, nor on the new task row */
-  if (row == self)
-    return FALSE;
-
-  return TRUE;
-}
-
-gboolean
 gtd_task_row_get_handle_subtasks (GtdTaskRow *self)
 {
   g_return_val_if_fail (GTD_IS_TASK_ROW (self), FALSE);
diff --git a/src/gtd-task-row.h b/src/gtd-task-row.h
index 4d6f053..0394995 100644
--- a/src/gtd-task-row.h
+++ b/src/gtd-task-row.h
@@ -49,9 +49,6 @@ void                      gtd_task_row_reveal                   (GtdTaskRow
 
 void                      gtd_task_row_destroy                  (GtdTaskRow          *row);
 
-gboolean                  gtd_task_row_is_drag_valid            (GtdTaskRow          *self,
-                                                                 GdkDragContext      *context);
-
 gboolean                  gtd_task_row_get_handle_subtasks      (GtdTaskRow          *self);
 
 void                      gtd_task_row_set_handle_subtasks      (GtdTaskRow          *self,