Pencil: Being able to drag layers without swapping

[CandyFace]

--Issue Summary--

When you drag a layer beneath another or in-between two, the layers will get swapped. This makes it difficult to organize layers when you have a lot of them.

As you add more layers and want them in-between, the problem grows.

--Actual Results

The layers are swapped, putting layer 2.5 at 2 spot and 2 and 2.5 spot.

--Expected Results--

The layer is moved between 2 and 3

--Video or Image Reference--

Example: move 2.5 between 2 and 3:

--Steps to reproduce--

Follow the gif above:

--System Information--

• Pencil2D Version:
  date: 2017-07-24_11:03:18

[scribblemaniac]

This will definitely be fixed in #533.

[Jose-Moreno]

@scribblemaniac @CandyFace This is related to this issue #436 which was brought up by JonasThomas he even did a video where he explained this and other stuff. https://www.youtube.com/watch?v=INAsUcpywL8&feature=youtu.be He did fix a few other problems around that issues, but this particular layer behavior got stuck. Could be worth taking a look at all that thread to understand what was implemented too.

[davidlamhauge]

This issue should be closed. Fixed long ago.

[Jose-Moreno]

@davidlamhauge You're right. This was fixed by #1147
Closing.