toolchainList = set(toolchainList) - set(storedToolchainList)
for element in toolchainList:
item = QListWidgetItem(element)
item.setData(Qt.UserRole, QVariant(element))
self.pageContent.toolchainList.addItem(item)
toolchainList = set(toolchainList) - set(storedToolchainList)
for element in toolchainList:
item = QListWidgetItem(element)
item.setData(Qt.UserRole, QVariant(element))
self.pageContent.toolchainList.addItem(item)