Tracker: Preload Trash icon manually, fixes #8696.

Change-Id: I171e6ee9305d4840e408a3b1c001fa5028d0bd95
Reviewed-on: https://review.haiku-os.org/c/haiku/+/10653
Reviewed-by: waddlesplash <[email protected]>
Tested-by: Commit checker robot <[email protected]>

src/kits/tracker/IconCache.cpp

@@ -965,6 +965,9 @@ IconCache::Preload(AutoLock<SimpleIconCache>* nodeCacheLocker,
 				entry = GetPrinterIcon(nodeCacheLocker, sharedCacheLocker,
 					&resultingOpenCache, model, source, mode, size, &lazyBitmap);
 				ASSERT(entry != NULL);
+			} else if (model->IsTrash()) {
+				// do not preload Trash icon, TrashWatcher handles it.
+				source = kNode;
 			} else {
 				if (source == kUnknownSource) {
 					// look for node icons first

src/kits/tracker/TrashWatcher.cpp

@@ -68,6 +68,16 @@ BTrashWatcher::BTrashWatcher()
 }
 
 
+thread_id
+BTrashWatcher::Run()
+{
+	fTrashFull = CheckTrashDirs();
+	UpdateTrashIcon();
+
+	return BLooper::Run();
+}
+
+
 BTrashWatcher::~BTrashWatcher()
 {
 	stop_watching(this);

src/kits/tracker/TrashWatcher.h

@@ -49,6 +49,7 @@ public:
 	BTrashWatcher();
 	virtual ~BTrashWatcher();
 
+	virtual thread_id Run();
 	bool CheckTrashDirs();
 	bool IsTrashNode(const node_ref*) const;