From 8a46c3dc640bd44819cc7c0344b5ec537cebcf73 Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Tue, 6 Dec 2022 13:36:14 +0100
Subject: [PATCH] windisplay: Only release capture when last mouse button is
 released

This fixes issues with lost up events when dragging out of the window with multiple buttons held

Fixes #1396
---
 panda/src/windisplay/winGraphicsWindow.cxx | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/panda/src/windisplay/winGraphicsWindow.cxx b/panda/src/windisplay/winGraphicsWindow.cxx
index 8b70b51938..1ca0425273 100644
--- a/panda/src/windisplay/winGraphicsWindow.cxx
+++ b/panda/src/windisplay/winGraphicsWindow.cxx
@@ -1671,7 +1671,9 @@ window_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) {
     if (_lost_keypresses) {
       resend_lost_keypresses();
     }
-    ReleaseCapture();
+    if (wparam == 0) {
+      ReleaseCapture();
+    }
     _input->button_up(MouseButton::button(0), get_message_time());
     return 0;
 
@@ -1679,7 +1681,9 @@ window_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) {
     if (_lost_keypresses) {
       resend_lost_keypresses();
     }
-    ReleaseCapture();
+    if (wparam == 0) {
+      ReleaseCapture();
+    }
     _input->button_up(MouseButton::button(1), get_message_time());
     return 0;
 
@@ -1687,7 +1691,9 @@ window_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) {
     if (_lost_keypresses) {
       resend_lost_keypresses();
     }
-    ReleaseCapture();
+    if (wparam == 0) {
+      ReleaseCapture();
+    }
     _input->button_up(MouseButton::button(2), get_message_time());
     return 0;
 
@@ -1696,7 +1702,9 @@ window_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) {
       if (_lost_keypresses) {
         resend_lost_keypresses();
       }
-      ReleaseCapture();
+      if (wparam == 0) {
+        ReleaseCapture();
+      }
       int whichButton = GET_XBUTTON_WPARAM(wparam);
       if (whichButton == XBUTTON1) {
         _input->button_up(MouseButton::button(3), get_message_time());