Add context manager for overriding VAE tiling params.

invokeai/backend/stable_diffusion/vae_tiling.py

@@ -0,0 +1,29 @@
+from contextlib import contextmanager
+
+from diffusers.models.autoencoders.autoencoder_kl import AutoencoderKL
+from diffusers.models.autoencoders.autoencoder_tiny import AutoencoderTiny
+
+
+@contextmanager
+def patch_vae_tiling_params(
+    vae: AutoencoderKL | AutoencoderTiny,
+    tile_sample_min_size: int,
+    tile_latent_min_size: int,
+    tile_overlap_factor: float,
+):
+    # Record initial config.
+    orig_tile_sample_min_size = vae.tile_sample_min_size
+    orig_tile_latent_min_size = vae.tile_latent_min_size
+    orig_tile_overlap_factor = vae.tile_overlap_factor
+
+    try:
+        # Apply target config.
+        vae.tile_sample_min_size = tile_sample_min_size
+        vae.tile_latent_min_size = tile_latent_min_size
+        vae.tile_overlap_factor = tile_overlap_factor
+        yield
+    finally:
+        # Restore initial config.
+        vae.tile_sample_min_size = orig_tile_sample_min_size
+        vae.tile_latent_min_size = orig_tile_latent_min_size
+        vae.tile_overlap_factor = orig_tile_overlap_factor