From 5b61cc1680e4d4dd015e1e12ea77840af132d7b0 Mon Sep 17 00:00:00 2001
From: xomx <xomx@users.noreply.github.com>
Date: Tue, 7 Nov 2023 00:03:32 +0100
Subject: [PATCH] Fix tab-closing crash by middle mouse button (unexpected
 mouse position)

The TabBar.h getTabIndexAt(int x, int y) could fail to find the tab-index (the underlying TCM_HITTEST WM returns -1, when there is no tab at the current mouse position).

Fix #14328, close #14329
---
 PowerEditor/src/WinControls/TabBar/TabBar.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/PowerEditor/src/WinControls/TabBar/TabBar.cpp b/PowerEditor/src/WinControls/TabBar/TabBar.cpp
index 8940a4ae55e..156f784787f 100644
--- a/PowerEditor/src/WinControls/TabBar/TabBar.cpp
+++ b/PowerEditor/src/WinControls/TabBar/TabBar.cpp
@@ -849,7 +849,8 @@ LRESULT TabBarPlus::runProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lPara
 			int xPos = LOWORD(lParam);
 			int yPos = HIWORD(lParam);
 			int currentTabOn = getTabIndexAt(xPos, yPos);
-			notify(TCN_TABDELETE, currentTabOn);
+			if (currentTabOn != -1)
+				notify(TCN_TABDELETE, currentTabOn);
 			return TRUE;
 		}