Do you want to request a feature or report a bug?
Bug

What is the current behavior?
When deleting after having made a selection that contains part of an immutable or segmented entity, the entity status of the entity is correctly removed but the text within it is not deleted.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. You can use this jsfiddle to get started: https://jsfiddle.net/stopachka/m6z0xn4r/.
Visit the draft.js entity example here: http://codepen.io/Kiwka/pen/wgpOoZ. Using the cursor, make a selection that includes part of the immutable "Superman" entity and some of the text that follows it (eg. "erman. Dele"). Click backspace.

What is the expected behavior?
The text within the entity should be deleted in accordance with the entity's deletion rules. In the case of the immutable entity example, all text within the entity should be deleted.

Which versions of Draft.js, and which browser / OS are affected by this issue? Did this work in previous versions of Draft.js?
All versions of Draft.js are affected on all browser / OS combinations. This bug did not work previously.