Paste into area with heading in the beginning of selection

[rinfex-holfer]

It is fairly common situation - when you paste something in wysiwyg, when there is heading in the beginning of this wysiwyg, but Chrome and Firefox acting quite different here.

Steps to reproduce:
1) create some blocks and create heading block in the beginning.

2) copy some blocks in clipboard

3) select part of created block with heading in the beginning of selection (or whole block)

4) paste and see the result in Chrome - all pasted html converted to the one big heading.

5) and in Firefox - it's ok

Chrome behavior in this situation is very annoying - sometimes you can lose all your markup. Firefox acting normal, I think.