Consider "from" member when determining patch conflicts

[sseago]

When "move" and "copy" jsonpatch operations are considered, two operations could conflict even if the "patch" members are not the same. If a copy operation is from "/foo" to "/bar" and there's a remove "/foo" operation as well, those two are in conflict even though they don't have the same path. The outcome will differ depending on the order of patch application. Similarly, a move and replace operation could be in conflict when the move "from" is equal to the replace "path".

One way to resolve this would be to consider "move" and "copy" operations as having two path elements, and they would conflict with any other operation containing either one of these as path elements (either as an "path" on any operation, or as a "from" field in another move or copy operation.