Bug Description

When a user goes to paste an item, upon the paste action the item does not always paste on the top layer.

Expected Behaviour

Pasted item would always be the top layer when pasted.

Steps to reproduce

1. Copy a block
2. Paste a block

Screenshots

Additional context

• WordPress version:
• Plugin version: 1.3-rc
• Gutenberg plugin version (if applicable):
• AMP plugin template mode:
• PHP version:
• OS:
• Browser: [e.g. chrome, safari]
• Device: [e.g. iPhone6]

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Acceptance criteria

• Pasted blocks should be on the top most layer of the page, i.e. in the block navigation it would appear at the top, not the bottom.

Implementation brief

Blocks are inserted when pasting in two places:

and

In both cases, the index where to set the block is currently set to null. We should replace that with an appropriate index to ensure that the block is pasted to the last position.

QA testing instructions

Using context menu

• Add an image to a story.
• Right click the image and select "cut".
• Add a text block to the same page.
• Right click the page just above the text block and select "paste".
• Verify that the image is pasted on top of the text block, not below.

Using keyboard

• Add an image to a story.
• Make sure the image has focus.
• Press ctrl-x/cmd-x to cut the image from the page.
• Add a text block to the same page.
• Make sure the page has focus.
• Press ctrl-v/cmd-v to paste the image to the page.
• Verify that the image is pasted on top of the text block, not below.

Demo

• https://youtu.be/SLKa-Djvggk

Changelog entry

• Changed behavior so that pasted elements are always inserted at the top