Handling multiple occurrence of the same sequence job corrected

Summary:
BUG: 396742

Capture may handle now multiple occurences of the same sequence
job correctly - e.g. RGBLRGB.

• Update from Wolfgang: review comments of Eric incorporated.
• Update from Eric: this is a squash of D14280 and D14309.

Reviewers: wreissenberger, mutlaqja

Reviewed By: mutlaqja

Subscribers: mutlaqja, kde-edu, TallFurryMan

Tags: KDE Edu

Differential Revision: https://phabricator.kde.org/D14357