Opaque typed records: Support adding memory pressure

src/Generation/Generator/Renderer/Internal/OpaqueTypedRecordHandle.cs

@@ -88,7 +88,7 @@ protected override bool ReleaseHandle()
     }}
 }}
 
-public class {ownedHandleTypeName} : {typeName}
+public partial class {ownedHandleTypeName} : {typeName}
 {{
     /// <summary>
     /// Creates a new instance of {ownedHandleTypeName}. Used automatically by PInvoke.
@@ -113,14 +113,23 @@ public class {ownedHandleTypeName} : {typeName}
     /// <returns>A {ownedHandleTypeName}</returns>
     public static {ownedHandleTypeName} FromUnowned(IntPtr ptr)
     {{
-       {RenderCopyStatement(record, "ownedPtr", "ptr")}
-       return new {ownedHandleTypeName}(ownedPtr);
+        {RenderCopyStatement(record, "ownedPtr", "ptr")}
+        return new {ownedHandleTypeName}(ownedPtr);
     }}
 
+    internal void SetMemoryPressure()
+    {{
+        AddMemoryPressure();
+    }}
+
+    partial void AddMemoryPressure();
+    partial void RemoveMemoryPressure();
+
     protected override bool ReleaseHandle()
     {{
-       {RenderFreeStatement(record, "handle")}
-       return true;
+        RemoveMemoryPressure();
+        {RenderFreeStatement(record, "handle")}
+        return true;
     }}
 }}";
     }

src/Generation/Generator/Renderer/Public/OpaqueTypedRecord.cs

@@ -37,6 +37,7 @@ public sealed partial class {name} : GLib.BoxedRecord, IEquatable<{name}>, IDisp
     public {name}({internalHandleName} handle)
     {{
         Handle = handle;
+        Handle.SetMemoryPressure();
         Initialize();
     }}
 

src/Libs/GLib-2.0/Internal/BytesHandle.cs

@@ -0,0 +1,19 @@
+using System;
+
+namespace GLib.Internal;
+
+public partial class BytesOwnedHandle
+{
+    private long _pressure;
+
+    partial void AddMemoryPressure()
+    {
+        _pressure = (long) Bytes.GetSize(this);
+        GC.AddMemoryPressure(_pressure);
+    }
+
+    partial void RemoveMemoryPressure()
+    {
+        GC.RemoveMemoryPressure(_pressure);
+    }
+}