Loading Icon + White Background don't move with window

[kordianbruck]

When a Window e.g. Imageview is moved while loading a picture, the loading screen doesn't move along with the window

[perryflynn]

Hi kordian,
thanks for your report.

This is a bug in the extjs framework:
http://www.sencha.com/forum/showthread.php?252691-4.2.0-beta-GridPanel-in-Window-loading-mask-doesn-t-move-with-Window

Hope that will be fixed in the next version.