…n a console error (#23666)

…sted block list, but root appender is used. (#23668)

* Remove use of getSelectionEnd to determine where blocks should be inserted

* Add e2e tests

Image edit: Fix cases where the edited Image src doesn't match the attachment ID. Includes backwards compatibility for WordPress 5.4 or lower.

* Search: Fix attribute defaults

Prior to d26842b, the Search block's label and buttonText attributes
defaulted to `__( 'Search' )`. This meant that adding a Search block to
a post or page resulted in `<!-- wp:search /-->` being inserted into the
HTML.

In d26842b, the defaults were removed so that Search could use a
block.json file. The default values were instead implemented using a
default block variation.

This, however, meant that Search blocks added prior to d26842b would
render with a blank label and button.

This fix is to default label and buttonText to `__( 'Search' )` in the
render_callback. Care must be taken here to permit these attributes to
be '' in which case the label and/or button are hidden.

* Try to trick GitHub into re-running tests

…3784)

Co-authored-by: Zebulan Stanphill <zebulanstanphill@protonmail.com>

Co-authored-by: Riad Benguella <benguella@gmail.com>