do not remove and set model when reloading cachev5.7.0

By removing and setting again the model the list header looses track of
which columns are hidded.

Testing Done:

* hide a column
* click button to check for updates
* column is still hidden (i.e. it didn't reappear)

1 files changed, 0 insertions, 2 deletions

diff --git a/src/PackageModel/PackageWidget.cpp b/src/PackageModel/PackageWidget.cpp
index 83b6e5f..73e242b 100644
--- a/src/PackageModel/PackageWidget.cpp
+++ b/src/PackageModel/PackageWidget.cpp
@@ -276,7 +276,6 @@ void PackageWidget::cacheReloadStarted()
     m_model->clear();
     m_proxyModel->clear();
     m_proxyModel->reset();
-    m_proxyModel->setSourceModel(0);
     m_busyWidget->start();
 }
 
@@ -285,7 +284,6 @@ void PackageWidget::cacheReloadFinished()
     QApt::PackageList packageList = m_backend->availablePackages();
     QFuture<QList<QApt::Package*> > future = QtConcurrent::run(sortPackages, packageList);
     m_watcher->setFuture(future);
-    m_proxyModel->setSourceModel(m_model);
     m_packageView->header()->setSectionResizeMode(0, QHeaderView::Stretch);
     startSearch();
 }