From dc0bfbc7241c0085f5dabb80b051f82b77187952 Mon Sep 17 00:00:00 2001
From: Le Philousophe
Date: Tue, 21 May 2019 17:42:55 +0200
Subject: COMMON: Fix button state desynchronization when warping mouse

---
 backends/events/default/default-events.cpp | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

(limited to 'backends/events/default')

diff --git a/backends/events/default/default-events.cpp b/backends/events/default/default-events.cpp
index 85cf44c960..86c56eadd2 100644
--- a/backends/events/default/default-events.cpp
+++ b/backends/events/default/default-events.cpp
@@ -281,15 +281,32 @@ void DefaultEventManager::purgeMouseEvents() {
 	while (!_eventQueue.empty()) {
 		Common::Event event = _eventQueue.pop();
 		switch (event.type) {
-		case Common::EVENT_MOUSEMOVE:
+		// Update button state even when purging events to avoid desynchronisation with real button state
 		case Common::EVENT_LBUTTONDOWN:
+			_mousePos = event.mouse;
+			_buttonState |= LBUTTON;
+			break;
+
 		case Common::EVENT_LBUTTONUP:
+			_mousePos = event.mouse;
+			_buttonState &= ~LBUTTON;
+			break;
+
 		case Common::EVENT_RBUTTONDOWN:
+			_mousePos = event.mouse;
+			_buttonState |= RBUTTON;
+			break;
+
 		case Common::EVENT_RBUTTONUP:
+			_mousePos = event.mouse;
+			_buttonState &= ~RBUTTON;
+			break;
+
 		case Common::EVENT_WHEELUP:
 		case Common::EVENT_WHEELDOWN:
 		case Common::EVENT_MBUTTONDOWN:
 		case Common::EVENT_MBUTTONUP:
+		case Common::EVENT_MOUSEMOVE:
 			// do nothing
 			break;
 		default:
-- 
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