[Drag & drop, intro] Prevent dropping in the impossible places (a.k.a. inception)

[Witoso]

📝 Provide detailed reproduction steps (if any)

Don’t show the drop target inside the element that is selected or where you cannot place it, examples:

1. Table into itself,
2. Block quote into itself.
3. Inline image to block's image caption.

✔️ Expected result

Drop target line doesn't show.

❌ Actual result

Drop target line does show.

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[pranavmappoli]

@Witoso ,
I feel inline element to itself also need to blocked.see here

we can drop a inline element over other. Is there any temporary solution available for this ?

[Witoso]

Replacement via drag & drop is a standard behavior, so the issue won't change this.

[pranavmappoli]

@Witoso , Is there any way to block this behavior?. if something dropped on the span, it should get rejected.