EXT-8491 FIXED Crash in LLAppearanceMgr::addCOFItemLink().

Reason:
When you click on a clothing link in COF, LLAppearanceMgr::wearItemOnAvatar() removes
all COF links of the clicked wearable type -- thus invalidating all previously
obtained LLViewerInventoryItems for those links -- and then passes such an
invalid item (item_to_wear) to addCOFItemLink() which of course crashes.

Fix:
1. Handle this case in wearItemOnAvatar(): don't try wearing COF items.
2. Disable the Wear button in the inventory SP when a COF item is selected.
3. Fixed get_can_item_be_worn() to return FALSE for items which are in COF or have links in COF.

Reviewed by Nyx at https://codereview.productengine.com/secondlife/r/811/

--HG--
branch : product-engine

indra/newview/llappearancemgr.cpp

@@ -983,6 +983,10 @@ bool LLAppearanceMgr::wearItemOnAvatar(const LLUUID& item_id_to_wear, bool do_up
 		LLNotificationsUtil::add("CannotWearTrash");
 		return false;
 	}
+	else if (gInventory.isObjectDescendentOf(item_to_wear->getUUID(), LLAppearanceMgr::instance().getCOF())) // EXT-84911
+	{
+		return false;
+	}
 
 	switch (item_to_wear->getType())
 	{

indra/newview/llinventoryfunctions.cpp

@@ -250,6 +250,18 @@ BOOL get_can_item_be_worn(const LLUUID& id)
 	const LLViewerInventoryItem* item = gInventory.getItem(id);
 	if (!item)
 		return FALSE;
+
+	if (LLAppearanceMgr::isLinkInCOF(item->getLinkedUUID()))
+	{
+		// an item having links in COF (i.e. a worn item)
+		return FALSE;
+	}
+
+	if (gInventory.isObjectDescendentOf(id, LLAppearanceMgr::instance().getCOF()))
+	{
+		// a non-link object in COF (should not normally happen)
+		return FALSE;
+	}
 	
 	switch(item->getType())
 	{

indra/newview/lloutfitslist.cpp

@@ -1005,11 +1005,6 @@ bool LLOutfitsList::canWearSelected()
 	{
 		const LLUUID& id = *it;
 
-		if (LLAppearanceMgr::isLinkInCOF(id))
-		{
-			return false;
-		}
-
 		// Check whether the item is worn.
 		if (!get_can_item_be_worn(id))
 		{

indra/newview/llpaneloutfitedit.cpp

@@ -779,9 +779,7 @@ void LLPanelOutfitEdit::updatePlusButton()
 	}
 
 	// If any of the selected items are not wearable (due to already being worn OR being of the wrong type), disable the add button.
-	uuid_vec_t::iterator unwearable_item = std::find_if(selected_items.begin(), selected_items.end(), !boost::bind(& get_can_item_be_worn, _1)
-		// since item can be not worn but in wearing process at that time - we need to check is link to item presents in COF
-		|| boost::bind(&LLAppearanceMgr::isLinkInCOF, _1));
+	uuid_vec_t::iterator unwearable_item = std::find_if(selected_items.begin(), selected_items.end(), !boost::bind(&get_can_item_be_worn, _1));
 	bool can_add = ( unwearable_item == selected_items.end() );
 
 	mPlusBtn->setEnabled(can_add);

indra/newview/llsidepanelinventory.cpp

@@ -33,10 +33,13 @@
 #include "llsidepanelinventory.h"
 
 #include "llagent.h"
+#include "llappearancemgr.h"
 #include "llavataractions.h"
 #include "llbutton.h"
 #include "llinventorybridge.h"
+#include "llinventoryfunctions.h"
 #include "llinventorypanel.h"
+#include "lloutfitobserver.h"
 #include "llpanelmaininventory.h"
 #include "llsidepaneliteminfo.h"
 #include "llsidepaneltaskinfo.h"
@@ -98,6 +101,8 @@ BOOL LLSidepanelInventory::postBuild()
 		my_inventory_panel->addHideFolderType(LLFolderType::FT_LANDMARK);
 		my_inventory_panel->addHideFolderType(LLFolderType::FT_FAVORITE);
 		*/
+
+		LLOutfitObserver::instance().addCOFChangedCallback(boost::bind(&LLSidepanelInventory::updateVerbs, this));
 	}
 
 	// UI elements from item panel
@@ -283,7 +288,7 @@ void LLSidepanelInventory::updateVerbs()
 		case LLInventoryType::IT_OBJECT:
 		case LLInventoryType::IT_ATTACHMENT:
 			mWearBtn->setVisible(TRUE);
-			mWearBtn->setEnabled(TRUE);
+			mWearBtn->setEnabled(get_can_item_be_worn(item->getLinkedUUID()));
 		 	mShopBtn->setVisible(FALSE);
 			break;
 		case LLInventoryType::IT_SOUND: