From 5ee474fdb86b146d17a6139bd94aeacec32bd1a6 Mon Sep 17 00:00:00 2001
From: Patryk Obara <dreamer.tan@gmail.com>
Date: Sat, 11 Apr 2020 00:54:48 +0200
Subject: [PATCH] Restore redraw instead of reset during expose

This prevents perceived lag window is being dragged (at least on Linux).
---
 src/gui/sdlmain.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/gui/sdlmain.cpp b/src/gui/sdlmain.cpp
index da11e263..cf01b93b 100644
--- a/src/gui/sdlmain.cpp
+++ b/src/gui/sdlmain.cpp
@@ -2401,7 +2401,8 @@ void GFX_Events() {
 				 * FOCUS_GAINED event to catch window startup
 				 * and size toggles.
 				 */
-				GFX_ResetScreen();
+				if (sdl.draw.callback)
+					sdl.draw.callback(GFX_CallBackRedraw);
 				GFX_UpdateMouseState();
 				continue;