Tracker: Fix drop onto file assume parent directory regression.

Also fix a minor TODO regarding dropping file onto root dir.

Regression from hrev59656, fixes #20069.

Change-Id: I153539cb714b9a5872eca16da3aa4a8de25c0f64
Reviewed-on: https://review.haiku-os.org/c/haiku/+/10890
Reviewed-by: John Scipione <[email protected]>
Tested-by: Commit checker robot <[email protected]>
Haiku-Format: Haiku-format Bot <[email protected]>

src/kits/tracker/PoseView.cpp

@@ -4898,8 +4898,6 @@ BPoseView::HandleDropCommon(BMessage* message, Model* targetModel, BPose* target
 
 	if (!wasHandled && poseView != NULL) {
 		BPoint where = message->GetPoint("click_pt", B_ORIGIN);
-		// TODO: removed check for root here need to do that, possibly at a
-		// different level
 		poseView->MoveSelectionTo(targetModel, dropPoint, srcWindow, where, moveMode);
 	}
 
@@ -5234,6 +5232,14 @@ BPoseView::MoveSelectionTo(Model* model, BPoint dropPoint, BContainerWindow* src
 
 	ASSERT(model != NULL);
 
+	// use this directory unless we were passed a directory
+	if (!(model->IsDirectory() || model->IsVirtualDirectory()))
+		model = TargetModel();
+
+	// don't allow dropping files onto root
+	if (model->IsRoot())
+		return;
+
 	// make sure this window is a legal drop target
 	if (srcWindow != window && !model->IsDropTarget())
 		return;