From 40e5560a3ce096847177090e3430bb8a55b64f4d Mon Sep 17 00:00:00 2001
From: Freaxed <andrea.anzani@gmail.com>
Date: Thu, 23 Mar 2023 14:14:21 +0100
Subject: [PATCH] BOutlineListView: fixed expansion causing items to disappear

On a multi-level list view, when expanding an item containing other collapsed lists, the last items disappear due to a wrong element counting.

Change-Id: I2313ad8efb23e8db54cd3563687bf0c2a775a12a
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6259
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Tested-by: Automation <automation@haiku-os.org>
Reviewed-by: Stefano Ceccherini <stefano.ceccherini@gmail.com>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
---
 src/kits/interface/OutlineListView.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/kits/interface/OutlineListView.cpp b/src/kits/interface/OutlineListView.cpp
index 483eac2f87..89b8d6b183 100644
--- a/src/kits/interface/OutlineListView.cpp
+++ b/src/kits/interface/OutlineListView.cpp
@@ -846,8 +846,10 @@ BOutlineListView::ExpandOrCollapse(BListItem* item, bool expand)
 				uint32 subLevel = item->fLevel;
 				items++;
 
-				while (--count > 0 && items[0]->fLevel > subLevel)
+				while (count > 0 && items[0]->fLevel > subLevel) {
 					items++;
+					count--;
+				}
 			} else
 				items++;
 		}