From 40f298a4390ed2ecbedc8b60637a935ead8b9b32 Mon Sep 17 00:00:00 2001
From: Dieter Blancke <dieter.blancke@outlook.com>
Date: Thu, 18 Aug 2022 12:40:03 +0200
Subject: [PATCH 1/2] Fixed an IndexOutOfBoundsException

---
 .../java/gwt/material/design/client/ui/MaterialCollapsible.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gwt-material/src/main/java/gwt/material/design/client/ui/MaterialCollapsible.java b/gwt-material/src/main/java/gwt/material/design/client/ui/MaterialCollapsible.java
index 80fbe50e3..6bff6efae 100644
--- a/gwt-material/src/main/java/gwt/material/design/client/ui/MaterialCollapsible.java
+++ b/gwt-material/src/main/java/gwt/material/design/client/ui/MaterialCollapsible.java
@@ -254,7 +254,7 @@ public void setActive(int index) {
     public void setActive(int index, boolean active) {
         activeIndex = index;
         if (isAttached()) {
-            if (index <= getWidgetCount()) {
+            if (index < getWidgetCount()) {
                 if (index > 0) {
                     activeWidget = getWidget(index);
                     if (activeWidget != null && activeWidget instanceof MaterialCollapsibleItem) {

From 03339afa601233fa700bc5bc91f684630c0d2b8c Mon Sep 17 00:00:00 2001
From: Dieter Blancke <dieter.blancke@outlook.com>
Date: Mon, 13 May 2024 14:04:39 +0200
Subject: [PATCH 2/2] Re-considering the index to be a 1-based index while
 still fixing the IndexOutOfBoundsException

---
 .../gwt/material/design/client/ui/MaterialCollapsible.java    | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gwt-material/src/main/java/gwt/material/design/client/ui/MaterialCollapsible.java b/gwt-material/src/main/java/gwt/material/design/client/ui/MaterialCollapsible.java
index 6bff6efae..6c4c2218d 100644
--- a/gwt-material/src/main/java/gwt/material/design/client/ui/MaterialCollapsible.java
+++ b/gwt-material/src/main/java/gwt/material/design/client/ui/MaterialCollapsible.java
@@ -254,9 +254,9 @@ public void setActive(int index) {
     public void setActive(int index, boolean active) {
         activeIndex = index;
         if (isAttached()) {
-            if (index < getWidgetCount()) {
+            if (index <= getWidgetCount()) {
                 if (index > 0) {
-                    activeWidget = getWidget(index);
+                    activeWidget = getWidget(index - 1);
                     if (activeWidget != null && activeWidget instanceof MaterialCollapsibleItem) {
                         ((MaterialCollapsibleItem) activeWidget).setActive(active);
                         reload();