media_download: fix md_mkdir_parent for Windows (drive letter, backslash), add errno to fopen errors, sanitize base_filename with WARNING

tools/chatgui/src/accountlist.cpp

@@ -84,6 +84,8 @@ AccountList::AccountList(DbManager* db, QWidget *parent)
     memberSplitter->setSizes({360, 240});
     layout->addWidget(memberSplitter, 1);
 
+    connect(m_listView->selectionModel(), &QItemSelectionModel::selectionChanged,
+            m_listView->viewport(), qOverload<>(&QWidget::update));
     connect(m_listView, &QListView::clicked, this, &AccountList::onMemberClicked);
     connect(m_listView, &QListView::doubleClicked, this, &AccountList::onMemberDoubleClicked);