Selecting an item and the mouse quickly changes selection before drag is started

[punker76]

Original author: gro...@gmail.com (November 07, 2009 19:14:39)

When clicking an item and moving the mouse quickly, rather than a drag on the
item that was clicked on being dragged, sometimes the selection changes
before the drag is started. This is particularly noticeable if clicking the
item causes the UI to lock up for a short time.

Original issue: http://code.google.com/p/gong-wpf-dragdrop/issues/detail?id=1

[punker76]

From gro...@gmail.com on November 07, 2009 19:16:46
We need to set e.Handled to prevent propagation of all MouseDown events until we can
determine whether a drag is initiated. Once we determine that no drag was initiated
then we need to pass the click to the control.

[punker76]

From DWick...@gmail.com on March 02, 2012 22:28:08
This can be fixed by disabling the automatic selection behavior for ListBox (where holding left mouse and dragging changes the selection).

ListBox does not let you disable this out of the box, so it's a bit of a hack:
http://stackoverflow.com/questions/5667998/prevent-wpf-listbox-from-selecting-item-under-mouse-when-layout-changes