ID 444677 - [C] Export: Contact Sheet created for selected panels will also include non-selected panels with the same digits

Problem summary
Exporting a Contact Sheet for selected panels whose IDs are two or more digits will result in non-selected panels present in the Revision, containing one or more of the same digits, to also be included in the Contact Sheet.

Customer reported version
Flix 6.3.3

Customer reported platform
macOS 10.15

Steps to reproduce

1) Create a Flix Sequence Revision with at least 12 panels

2) Select panel ids 11 and 12, and export Contact Sheet for those two only.

Expected behaviour
Flix should export a PDF with panels 11 and 12.

Actual behaviour
Flix exports a PDF containing panels 1, 2, 11 and 12.

Reproduced by support

This bug has been reproduced in:
6.3.3 - macOS 10.14 Client - Windows 10 Client - macOS 10.14 Server - CentOS 7 Server