chatgui: double-click member edit, fix delegate backgrounds; transport: invite_sync/member_sync robustness

tools/chatgui/src/accountdelegate.cpp

@@ -14,6 +14,8 @@ void AccountDelegate::paint(QPainter *painter, const QStyleOptionViewItem &optio
         painter->fillRect(option.rect, option.palette.highlight());
     else if (option.state & QStyle::State_MouseOver)
         painter->fillRect(option.rect, QColor(240, 240, 240));
+    else
+        painter->fillRect(option.rect, option.palette.base());
 
     const int margin = 4;
     const int iconSz = 24;