use the view, viewmodel, controller style code, which makes the logic
much more understandable
this adds two features to it, namely a viewBuffer range, which controls
the distance to the end of the data on which the panel loads the next data
and an optional failCallback, which will be used for the cephlog
this also fixes#2151
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
commit acc9bf4752972ffd79af1c78510fcce24c2db959 (Close#1268: Show
migration start server and migration end server) introduced the
possibility to display additional information in the TaskViewer
window title. This change happened after the widget toolkit formed
and seems reasonable to have here, thus port it over.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
