Dragging Widget or block over text widget and letting go pastes text

[DaisyOlsen]

Describe the bug
When I dragged the Tag Cloud and happened to be over a Text widget’s text area when I let go of it, the text went into the Text widget instead of moving the Tag Cloud widget.

To reproduce
Steps to reproduce the behavior:

1. Go to Widgets Screen
2. Classic Text widget should be in widget area
3. Add a Tag Cloud (probably not limited to this specific block or widget)
4. Drag Tag Cloud over text widget and let go

Expected behavior
Widget or block should not paste the text into the text widget.

Originally reported here: https://make.wordpress.org/core/2020/09/30/call-for-testing-the-widgets-screen-in-gutenberg-9-1/#comment-40016

[draganescu]

I wasn't able to test this because the classic editor throws an error on master in the widgets screen.

[kevin940726]

It's still unclear whether we should add support for the classic widget in the widgets screen: #15916 (comment).

[Mamaduka]

I was able to reproduce this issue using the following steps:

1. Add Text widget in Classic Widget editor.
2. Activate the Gutenberg plugin.
3. Add Tag Cloud.
4. Dragged Tag Cloud over text widget and let go.

Screenshot

We discussed this issue during the triage session, and a possible solution is to ignore text area when dragging a block.

Discussion link - https://wordpress.slack.com/archives/C02QB2JS7/p1618293123294400

[adamziel]

I found that the text widget remains in editing mode only as long as I keep editing it (keep focus inside). As soon as I click on the tag cloud (or anywhere else), it defaults to the preview mode. While this doesn't solve the problem of dropping blocks in textareas, it seems good enough to close this issue.