From e68d2c191f88f742fd0186928f26b7b7fcfabe43 Mon Sep 17 00:00:00 2001
From: James Teh <jteh@mozilla.com>
Date: Sun, 30 Jun 2024 18:06:02 +0000
Subject: [PATCH] Bug 1905065: When a caret is at the end of a line, have
 TextLeafPoint::FindBoundary return no character for BOUNDARY_CLUSTER. 
 a=RyanVM

We already did this for BOUNDARY_CHAR, but i neglected to update this for cluster in bug 855184.
Without this, FindBoundary with BOUNDARY_CLUSTER on a caret TextLeafPoint when the caret is at the end of a line would return the last cluster instead of no character.

Differential Revision: https://phabricator.services.mozilla.com/D215178
---
 accessible/base/TextLeafRange.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/accessible/base/TextLeafRange.cpp b/accessible/base/TextLeafRange.cpp
index a1cbbd763995..b790af364c78 100644
--- a/accessible/base/TextLeafRange.cpp
+++ b/accessible/base/TextLeafRange.cpp
@@ -1049,7 +1049,8 @@ TextLeafPoint TextLeafPoint::FindBoundary(AccessibleTextBoundary aBoundaryType,
                                           nsDirection aDirection,
                                           BoundaryFlags aFlags) const {
   if (IsCaret()) {
-    if (aBoundaryType == nsIAccessibleText::BOUNDARY_CHAR) {
+    if (aBoundaryType == nsIAccessibleText::BOUNDARY_CHAR ||
+        aBoundaryType == nsIAccessibleText::BOUNDARY_CLUSTER) {
       if (IsCaretAtEndOfLine()) {
         // The caret is at the end of the line. Return no character.
         return ActualizeCaret(/* aAdjustAtEndOfLine */ false);