background action should support transparent GIF images

Registered by Nadia Alramli

Currently the background action ignores 'P' mode images even if they contain transparency.
This can be fixed by changing the transparent color to the selected color, and removing the transparency index from info. We can add a warning when the user attempts to add a semi-transparent background because 'P' mode doesn't support alpha transparency.

Blueprint information

Status:
Complete
Approver:
Stani
Priority:
Medium
Drafter:
Nadia Alramli
Direction:
Approved
Assignee:
Nadia Alramli
Definition:
Approved
Series goal:
Accepted for 0.2
Implementation:
Implemented
Milestone target:
milestone icon 0.2.1
Started by
Nadia Alramli
Completed by
Stani

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Stani: Nadia, didn't you finish this one?

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