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ignore sourceDataChanged on invalid indexes

Marco Martin requested to merge work/mart/invalidindexesdatachanged into master

It is actually possible in a real world scenario that the source model emits dataChanged with invalid indexes when the source model is a QSortFilterProxyModel because QSortFilterProxyModel doesn't check for mapped indexex validity when its source model emitted dataChanged on a column QSortFilterProxyModel doesn't accept.

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