mach: render during resize

src/platform/native.zig

@@ -299,6 +299,7 @@ pub const Platform = struct {
                 const pf = (window.getUserPointer(UserPtr) orelse unreachable).platform;
                 pf.last_framebuffer_size.width = width;
                 pf.last_framebuffer_size.height = height;
+                render(pf.core) catch {};
             }
         }.callback;
         platform.window.setFramebufferSizeCallback(framebuffer_size_callback);
@@ -592,6 +593,11 @@ pub fn main() !void {
     defer app.deinit(core);
 
     while (!core.internal.window.shouldClose()) {
+        try render(core);
+    }
+}
+
+fn render(core: *Core) !void {
     // On Darwin targets, Dawn requires an NSAutoreleasePool per frame to release
     // some resources. See Dawn's CHelloWorld example.
     const pool = try util.AutoReleasePool.init();
@@ -601,7 +607,6 @@ pub fn main() !void {
 
     try app.update(core);
 }
-}
 
 pub fn coreInit(allocator: std.mem.Allocator) !*Core {
     const core: *Core = try allocator.create(Core);