Supper IP Adapter weight loading in StableDiffusionXLControlNetInpaintPipeline (#7031)

* support ip adapter loading

* fix style

src/diffusers/pipelines/controlnet/pipeline_controlnet_inpaint_sd_xl.py

@@ -28,7 +28,12 @@ from transformers import (
 )
 
 from ...image_processor import PipelineImageInput, VaeImageProcessor
-from ...loaders import FromSingleFileMixin, StableDiffusionXLLoraLoaderMixin, TextualInversionLoaderMixin
+from ...loaders import (
+    FromSingleFileMixin,
+    IPAdapterMixin,
+    StableDiffusionXLLoraLoaderMixin,
+    TextualInversionLoaderMixin,
+)
 from ...models import AutoencoderKL, ControlNetModel, ImageProjection, UNet2DConditionModel
 from ...models.attention_processor import (
     AttnProcessor2_0,
@@ -146,7 +151,7 @@ def rescale_noise_cfg(noise_cfg, noise_pred_text, guidance_rescale=0.0):
 
 
 class StableDiffusionXLControlNetInpaintPipeline(
-    DiffusionPipeline, StableDiffusionXLLoraLoaderMixin, FromSingleFileMixin
+    DiffusionPipeline, StableDiffusionXLLoraLoaderMixin, FromSingleFileMixin, IPAdapterMixin
 ):
     r"""
     Pipeline for text-to-image generation using Stable Diffusion XL.
@@ -158,6 +163,7 @@ class StableDiffusionXLControlNetInpaintPipeline(
         - [`~loaders.StableDiffusionXLLoraLoaderMixin.load_lora_weights`] for loading LoRA weights
         - [`~loaders.StableDiffusionXLLoraLoaderMixin.save_lora_weights`] for saving LoRA weights
         - [`~loaders.FromSingleFileMixin.from_single_file`] for loading `.ckpt` files
+        - [`~loaders.IPAdapterMixin.load_ip_adapter`] for loading IP Adapters
 
     Args:
         vae ([`AutoencoderKL`]):