From 868504d22d5150eab6616a41620157cab2b8fb66 Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Fri, 28 Mar 2025 23:18:17 +1100
Subject: [PATCH] [client] core: fix dynamic res switch race issue

---
 client/src/core.c | 30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/client/src/core.c b/client/src/core.c
index 86ffed7f..fa38b97d 100644
--- a/client/src/core.c
+++ b/client/src/core.c
@@ -190,19 +190,27 @@ bool core_warpPointer(int x, int y, bool exiting)
 
 void core_updatePositionInfo(void)
 {
-  if (g_state.kvmfrFeatures & KVMFR_FEATURE_WINDOWSIZE)
+  if (g_state.pointerQueue &&
+      g_state.kvmfrFeatures & KVMFR_FEATURE_WINDOWSIZE)
   {
-    const KVMFRWindowSize msg = {
-      .msg.type = KVMFR_MESSAGE_WINDOWSIZE,
-      .w        = g_state.windowW,
-      .h        = g_state.windowH
-    };
+    static unsigned lastW = 0, lastH = 0;
+    if (lastW != g_state.windowW || lastH != g_state.windowH)
+    {
+      lastW = g_state.windowW;
+      lastH = g_state.windowH;
 
-    uint32_t serial;
-    LGMP_STATUS status;
-    if ((status = lgmpClientSendData(g_state.pointerQueue,
-          &msg, sizeof(msg), &serial)) != LGMP_OK)
-      DEBUG_WARN("Message send failed: %s", lgmpStatusString(status));
+      const KVMFRWindowSize msg = {
+        .msg.type = KVMFR_MESSAGE_WINDOWSIZE,
+        .w        = g_state.windowW,
+        .h        = g_state.windowH
+      };
+
+      uint32_t serial;
+      LGMP_STATUS status;
+      if ((status = lgmpClientSendData(g_state.pointerQueue,
+            &msg, sizeof(msg), &serial)) != LGMP_OK)
+        DEBUG_WARN("Message send failed: %s", lgmpStatusString(status));
+    }
   }
 
   if (!g_state.haveSrcSize)