DnD error

[sander]

item "78" doesn't exist
item "78" doesn't exist
    while executing
"$T selection modify $drop $dnd(drop)"
    ("drag" arm line 89)
    invoked from within
"switch $dnd(buttonMode) {
 "drag" {
     if {!$dnd(drag,motion)} {

  # Detect initial mouse movement
  if {(abs($x - $dnd(drag,click,x)) <= 4) &&
 ..."
    (procedure "DnDMotion" line 5)
    invoked from within
"DnDMotion $T $x $y"
    ("drag" arm line 4)
    invoked from within
"switch $dnd(buttonMode) {
 "drag" {
     set Priv(autoscan,command,$T) {::TreeCtrl::DnDMotion %T %x %y}
     AutoScanCheck $T $x $y
     DnDMotion $T ..."
    (procedure "::TreeCtrl::DnDMotion1" line 7)
    invoked from within
"::TreeCtrl::DnDMotion1 .jmain.f.ro.box.tree 62 185"
    (command bound to event)

[Mats (matsben)]

The only way I can see this happen is if the item has been removed
while dragging.
When I wrote TreeCtrlDnD I assumed for simplicity that the tree was
static while dragging, knowing that this was a simplification. Seems
I've hit the hard rock now :-(

[Mats (matsben)]

This should now work, but it is a complicated business to keep track of both dragged items and drop targets when both can suddenly be deleted. Tested when both dragged and dropped items are deleted, for instance, when the presence status of a contact is changed.

[sander (s-devrieze)]

Other bug:

can't read "dnd(lastDrop)": no such element in array
can't read "dnd(lastDrop)": no such element in array
    while executing
"DnDItemExists $T $dnd(lastDrop)"
    (procedure "DnDCheckExistence" line 20)
    invoked from within
"DnDCheckExistence $T"
    (procedure "::TreeCtrl::DnDRelease1" line 7)
    invoked from within
"::TreeCtrl::DnDRelease1 .jmain.f.ro.box.tree 58 48"
    (command bound to event)

[Mats (matsben)]

There have been several more fixes since then.

[sander (s-devrieze)]

Bug in Window version running under Wine 0.9.46 (acting as Vista):

can't read "dnd(drop)": no such element in array
can't read "dnd(drop)": no such element in array
    while executing
"DnDItemExists $T $dnd(drop)"
    (procedure "TreeCtrl::DnDLeave" line 6)
    invoked from within
"TreeCtrl::DnDLeave .jmain.f.ro.box.tree 44 266
"
    (command bound to event)

[Mats (matsben)]

Happened when I tried to reset item dragging if leaving widget.
Fixed.