Fix explorer item creation and disposal

[jeanp413]

This PR reapplies the changes from #72627 and the improvements from here and here.
Adittionaly has some changes to fix #78153 reported issues

[jeanp413]

This fixes the bug from the second gif from #78153 (comment)

[isidorn]

Can you please put this in a seperate PR. I like this simple change and it is in the tree land so I would love if we merge it in unrelated to this.

[jeanp413]

Ok

[jeanp413]

Opened #79540 and it's corresponding PR #79542

[isidorn]

Can you please put this in a seperate PR. I like this simple change and it is in the tree land so I would love if we merge it in unrelated to this.

[isidorn]

Why not use getEditableData?
That API is already there and gives you everything you need.

[jeanp413]

getEditableData just return the data, I need the stat so I can call this.tree.getRelativeTop(editable.stat)

[isidorn]

@jeanp413 thanks a lot for your PR.
I have added some comments inline, can you please address them?

Also did you intensivly test this out? There are quite some corner cases (as you are probably aware of). And this code is quite delicate (hacky).
I tried it out quickly and seems to work well (but plan to test it more once we adress the things I mentioned in the review).

[jeanp413]

I tested it for the bugs reported in #72626, #75693. #75624, #78153
Did you find a corner case that's not covered?

[isidorn]

@jeanp413 thanks for the PR and for updating it.
However for now I have decided to go with the current approach. And we can change this next milestone after we get some feedback, thus assigning it to september. The current limitations of the approach are dangling input elements and the input box not closing on scroll. For now I can live with that.

[isidorn]

I have tested this now more. Seems to work fine and looks good. Let's merge it in to get feedback from insiders users.
Thanks a lot for this PR.