Avoid unnecessary sequencing jobs in PreviewGenerator

Akseli Lahtinenrequested to merge
work/akselmo/avoid-unnecessary-sequence-updates into master

Currently we keep constantly asking if the current item has sequences support or not.

By sequences we mean things like hovering mouse over a folder thumbnail and it goes through the files in it.

This MR will always run for the first sequence (the initial thumbnail) but for the rest, then toggles a flag for the node with Qt::DecorationPropertyRole. If the propertyrole is false, it skips any further updates to avoid any unnecessary previewjob runs.

Edited by Akseli Lahtinen

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