[Bug 56431] Dotnet TreeView disappearing plus-sign

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=56431

--- Comment #29 from [e-mail] ---
Okay I had to adjust my workaround again, because whith my last change the
insert of new nodes was not longer working corectly.

Now it seems I have a working workaround:
The problem is, at collapse the "children" parameter is set to 0... so the
treeview thinks we do not longer need a plus sign, because there are no childs.

As hotfix I changed the resulting lines to set children to 1 instead of 0:

# Change 1:
TREEVIEW_UnlinkItem(const TREEVIEW_ITEM *item)
{
    TREEVIEW_ITEM *parentItem;

assert(item != NULL);
    assert(item->parent != NULL); /* i.e. it must not be the root */

parentItem = item->parent;

if (parentItem->firstChild == item)
    parentItem->firstChild = item->nextSibling;

if (parentItem->lastChild == item)
    parentItem->lastChild = item->prevSibling;

if (parentItem->firstChild == NULL && parentItem->lastChild == NULL
    && parentItem->cChildren > 0)
    parentItem->cChildren = 1; // !!!!!!!!!!!originally it is set to 0 here
!!!!!!!!!!!!

# Change 2:
TREEVIEW_RemoveAllChildren(TREEVIEW_INFO *infoPtr, const TREEVIEW_ITEM
*parentItem)
{
    TREEVIEW_ITEM *kill = parentItem->firstChild;

while (kill != NULL)
    {
    TREEVIEW_ITEM *next = kill->nextSibling;

TREEVIEW_RemoveItem(infoPtr, kill);

kill = next;
    }

// !!!!!!!!!!!originally it is compared against 0 here !!!!!!!!!!!!
    assert(parentItem->cChildren <= 1); /* I_CHILDRENCALLBACK or 0 */