From: PT Linux Launcher maintainers
Subject: Avoid idle waits for direct Wayland resize configures

The lazy-output-images backport leaves no shared output images allocated while
Gamescope is presenting the game directly as Wayland planes. A host-window
configure nevertheless calls vulkan_remake_output_images(), whose unconditional
device-idle wait and output-sized blank-texture recreation stall the compositor
thread for every intermediate drag size.

Wait only when an output or screenshot image actually exists. The transparent
fallback texture is unused by the non-session Wayland backend, so retain it
across Wayland size changes; session backends preserve the existing recreation
behavior. If a frame later requires full composition, the lazy allocation path
creates correctly sized output images before rendering it.

--- a/src/rendervulkan.cpp
+++ b/src/rendervulkan.cpp
@@ -3374,7 +3374,21 @@ static bool vulkan_ensure_output_images()
 bool vulkan_remake_output_images()
 {
 	VulkanOutput_t *pOutput = &g_output;
-	g_device.waitIdle();
+	bool bHasLiveImages =
+		!pOutput->outputImages.empty() && pOutput->outputImages[0];
+	if ( !bHasLiveImages )
+	{
+		for ( const auto &pScreenshotImage : pOutput->pScreenshotImages )
+		{
+			if ( pScreenshotImage )
+			{
+				bHasLiveImages = true;
+				break;
+			}
+		}
+	}
+	if ( bHasLiveImages )
+		g_device.waitIdle();
 
 	pOutput->nOutImage = 0;
 
@@ -3386,7 +3400,8 @@ bool vulkan_remake_output_images()
 	{
 		pOutput->outputImages.clear();
 		pOutput->outputImagesPartialOverlay.clear();
-		pOutput->temporaryHackyBlankImage = vulkan_create_debug_blank_texture();
+		if ( GetBackend()->IsSessionBased() || !pOutput->temporaryHackyBlankImage )
+			pOutput->temporaryHackyBlankImage = vulkan_create_debug_blank_texture();
 		return true;
 	}