Simplify and clean up

Remove the Undo code for deleting a clip and replace it with simpler
parent/child undo relationship.

Move block gathering code to seperate function. It's quite brute
force and might lead to issues further down the line with more
complex composited node setups.

app/project/projectviewmodel.cpp

@@ -642,52 +642,4 @@ void ProjectViewModel::OfflineFootageCommand::undo_internal()
   }
 }
 
-ProjectViewModel::DeleteFootageCommand::DeleteFootageCommand(ProjectViewModel *model, ItemPtr item,
-                                                             QMap<Node *, StreamPtr> nodes, QUndoCommand *parent)
-    :
-  UndoCommand(parent),
-  model_(model),
-  item_(item),
-  nodes_(nodes)
-{
-  deleteCommand_ = new QUndoCommand();
-}
-
-Project *ProjectViewModel::DeleteFootageCommand::GetRelevantProject() const
-{
-  return model_->project();
-}
-
-void ProjectViewModel::DeleteFootageCommand::redo_internal()
-{
-  QList<ItemPtr> sequences = model_->project()->get_items_of_type(Item::kSequence);
-
-  blocks_.clear();
-
-  foreach (ItemPtr seq, sequences) {
-    Sequence *s = static_cast<Sequence *>(seq.get());
-    // Loop through nodes in sequence
-    foreach (Node *node, s->nodes()) {
-      // For each Block see if it is linked to one of the Footage nodes add it to the delete list
-      if (node->IsBlock()) {
-        foreach (Node *input, nodes_.keys()) {
-          if (node->GetExclusiveDependencies().contains(input)) blocks_.append(static_cast<Block *>(node));
-        }
-      }
-    }
-  }
-  TimelineWidget::ReplaceBlocksWithGaps(blocks_, true, deleteCommand_);
-  Core::instance()->undo_stack()->pushIfHasChildren(deleteCommand_);
-
-  parent_ = item_->parent();
-  model_->RemoveChild(parent_, item_.get());
-}
-
-void ProjectViewModel::DeleteFootageCommand::undo_internal()
-{
-  model_->AddChild(parent_, item_);
-  deleteCommand_->undo();
-}
-
-
 OLIVE_NAMESPACE_EXIT