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Fix #159: reset unused-element highlight when elements become used again
ElementsCollectionModel::highlightUnusedElement() only ever painted the currently-unused elements red; it never cleared the background of items that were no longer unused. So when an element was re-added to a project and saved, its red 'unused' highlight persisted until the model was rebuilt from scratch. Reset every item's background before re-applying the highlight to the current unused set.
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@@ -538,6 +538,11 @@ QList<QETProject *> ElementsCollectionModel::project() const
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*/
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void ElementsCollectionModel::highlightUnusedElement()
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{
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//Reset the background of every item first, so elements that are no
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//longer unused lose their previous red highlight (issue #159).
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for (ElementCollectionItem *eci : items())
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eci->setBackground(QBrush());
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QList <ElementsLocation> unused;
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foreach (QETProject *project, m_project_list)
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