The scenario is that you write some text like this
I remember at some point that codinghorror said
this thing
Now, I want to make ‘this thing’ a blockquote, so I select it and click the blockquote button in the toolbar.
That will give me
I remember at some point that codinghorror said
> this thing
But if I accidently select “this thing”, and then click , it replaces whatever I had selected in the composer with the raw text.
That behaviour is not wrong, it’s user error. The point is that it should be possible to undo that user error: