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Draw embedded images only a single time
Embedded images were previously drawn once for each character in the embed key, causing issues for semi-transparent images. See issue #278. With this commit, the embed image is only drawn for the first character in the embed key, and a sentinel attribute is used for the remaining characters in the key to draw neither text not an image for them.
Coverage decreased (-0.007%) to 97.65% when pulling 9ebd42d91f82011d26caf9d745627e6e2b79841d on Qgel:issue-278-embed-draw into 1b7dc6716cdfb4c404fae5ec8bef8d780d918b9f on andymeneely:dev.