rhi: vulkan: Silence useless desc.set validation warnings

This is deemed more appropriate than having some time consuming tracking
of descriptor types in pools, just to avoid the rare case of attempting
a failing vkAllocateDescriptorSets(), which is then always followed by
another, successful attempt.

Change-Id: I7a3a1d80afe400dc96605a3d6c834e8b2c71143a
Reviewed-by: Christian Strømme <christian.stromme@qt.io>

src/gui/rhi/qrhivulkan.cpp

@@ -345,6 +345,15 @@ static bool qvk_debug_filter(VkDebugReportFlagsEXT flags, VkDebugReportObjectTyp
         return true;
     }
 
+    // In certain cases allocateDescriptorSet() will attempt to allocate from a
+    // pool that does not have enough descriptors of a certain type. This makes
+    // the validation layer shout. However, this is not an error since we will
+    // then move on to another pool. If there is a real error, a qWarning
+    // message is shown by allocateDescriptorSet(), so the validation warning
+    // does not have any value and is just noise.
+    if (strstr(pMessage, "VUID-VkDescriptorSetAllocateInfo-descriptorPool-00307"))
+        return true;
+
     return false;
 }