Customizing position of the drag and drop tooltip

[AspectUnk]

Hello. I can customize a tooltip using BeginDragDropSource with ImGuiDragDropFlags_SourceNoPreviewTooltip, but not the position because i cannot disable the SetNextWindowPos call. Previously SetNextWindowPos was called inside BeginDragDropSource which disabled its call. Perhaps there is a reason for this. At the moment I see two fixes:

1. Will go back to the old version. Where the tooltip position is set inside BeginDragDropSource.
2. Add a flag ImGuiTooltipFlags_IgnoreDragDrop which should be checked here. Something like of this:
   if ((tooltip_flags & ImGuiTooltipFlags_IgnoreDragDrop) == 0 && (g.DragDropWithinSource || g.DragDropWithinTarget))

[ocornut]

Hello, this should now be solved with 1e939fc, it was a pretty simple change. You can now call SetNextWindowPos() before BeginTooltip() while in a drag and drop source or target.

I wonder if we should introduce a new ImGuiCond_NoOverrideSetExistingValue flag to formalize this idiom since it is used in various places.