Depth of Field issues

A couple screenshots:

Widget appears to blur the edges of the object in the foreground with the background; this should not occur.
Also appears that certain effects (e.g. aircraft jets) completely ignore depth of field, creating a weird (and somewhat cool) visual glitch.

Start by reproducing the depth-of-field behavior shown in the two attached screenshots, checking both foreground object edges and effects such as aircraft jets. Trace the rendering path responsible for depth of field and compare affected and unaffected effects; done means foreground edges remain distinct from the background and applicable effects respect depth of field.

Written by the indexing model from the issue text.