Force restore saved selections after inserting links into the editor

Force restore saved selections after inserting links into the editor

Redactor‘s selection handling is very fragile and “forgetting” to restore the selection can cause some very strange side-effects.

The user will start typing inside a selection marker, which will not cause any visual effects, but the content will get lost once the editor removes the markers.

See https://www.woltlab.com/community/thread/296022-einf%C3%BCgen-von-links-im-editor-unter-ipados/
See https://www.woltlab.com/community/thread/296116-einf%C3%BCgen-von-links-im-editor-unter-ipados-text-verschwindet/
See https://www.woltlab.com/community/thread/294753-text-wird-beim-speichern-abgeschnitten/