fix(LexicalNode): fix inline decorator isSelected

[jason89521]

Why

I pressed shift + ArrowLeft at the beginning of the video, and then pressed BackSpace to delete the selection. You can see the image node is selected, but when I deleted the selection, it didn't been deleted. Actually, the image node was not selected.

At the second half of the video, I pressed shift + ArrowRight, the first image also showed that it was selected. However, the image node didn't been selected actually, so when I deleted the selection, the image node didn't been deleted.

https://github.com/facebook/lexical/assets/47748132/8b33a6fb-f6e1-41b1-b5cd-3aded298e3d4

What

Beside checking whether the selection is collapsed, we should also check non-collapsed situation.

How

First, check whether the node is an inline decorator node.

Then check whether the anchor is before the focus.

• If so
  • check whether the anchor at the element node's last offset
  • check whether the anchor's node is the decorator node's parent
  • check whether the decorator node is the last child
  • if the above 3 conditions are satisfied, return false
• else
  • check whether the focus at the element node's last offset
  • check whether the focus's node is the decorator node's parent
  • check whether the decorator node is the last child
  • if the above 3 conditions are satisfied, return false

Additional Information

After this pr:

https://github.com/facebook/lexical/assets/47748132/f3e3257b-f26d-45d4-8322-672dda184d9e

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[StyleT]

Hi! Thanks for the contribution!

Can you pls write tests to cover this use case?

[jason89521]

@StyleT added in c1d6ada!

[jason89521]

@StyleT Hi, just a gentle nudge to see if you could take a moment to review this pull request when you have a chance. Thanks!