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diff --git a/indra/newview/llfloaterchangeitemthumbnail.h b/indra/newview/llfloaterchangeitemthumbnail.h
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+++ b/indra/newview/llfloaterchangeitemthumbnail.h
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+/** 
+ * @file llfloaterchangeitemthumbnail.h
+ * @brief LLFloaterChangeItemThumbnail class definition
+ *
+ * $LicenseInfo:firstyear=2023&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2023, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLFLOATERCHANGEITEMTHUMBNAIL_H
+#define LL_LLFLOATERCHANGEITEMTHUMBNAIL_H
+
+#include "llfloater.h"
+#include "llinventoryobserver.h"
+#include "llvoinventorylistener.h"
+
+class LLButton;
+class LLIconCtrl;
+class LLTextBox;
+class LLThumbnailCtrl;
+class LLUICtrl;
+class LLViewerInventoryItem;
+class LLViewerFetchedTexture;
+
+class LLFloaterChangeItemThumbnail : public LLFloater, public LLInventoryObserver, public LLVOInventoryListener
+{
+public:
+    LLFloaterChangeItemThumbnail(const LLSD& key);
+	~LLFloaterChangeItemThumbnail();
+
+    BOOL postBuild() override;
+    void onOpen(const LLSD& key) override;
+    void onFocusReceived() override;
+    void onMouseEnter(S32 x, S32 y, MASK mask) override;
+
+    BOOL handleDragAndDrop(
+        S32 x,
+        S32 y,
+        MASK mask,
+        BOOL drop,
+        EDragAndDropType cargo_type,
+        void *cargo_data,
+        EAcceptance *accept,
+        std::string& tooltip_msg) override;
+
+    void changed(U32 mask) override;
+    void inventoryChanged(LLViewerObject* object,
+        LLInventoryObject::object_list_t* inventory,
+        S32 serial_num,
+        void* user_data) override;
+
+    static bool validateAsset(const LLUUID &asset_id);
+
+private:
+
+    LLInventoryObject* getInventoryObject();
+    void refreshFromInventory();
+    void refreshFromObject(LLInventoryObject* obj);
+
+    static void onUploadLocal(void*);
+    static void onUploadSnapshot(void*);
+    static void onUseTexture(void*);
+    static void onCopyToClipboard(void*);
+    static void onPasteFromClipboard(void*);
+    static void onRemove(void*);
+    static void onRemovalConfirmation(const LLSD& notification, const LLSD& response, LLHandle<LLFloater> handle);
+
+    void assignAndValidateAsset(const LLUUID &asset_id, bool silent = false);
+    static void onImageDataLoaded(BOOL success,
+        LLViewerFetchedTexture *src_vi,
+        LLImageRaw* src,
+        LLImageRaw* aux_src,
+        S32 discard_level,
+        BOOL final,
+        void* userdata);
+    static void onFullImageLoaded(BOOL success,
+                                  LLViewerFetchedTexture* src_vi,
+                                  LLImageRaw* src,
+                                  LLImageRaw* aux_src,
+                                  S32 discard_level,
+                                  BOOL final,
+                                  void* userdata);
+
+    void showTexturePicker(const LLUUID &thumbnail_id);
+    void onTexturePickerCommit();
+
+    void setThumbnailId(const LLUUID &new_thumbnail_id);
+    static void setThumbnailId(const LLUUID& new_thumbnail_id, const LLUUID& object_id);
+    static void setThumbnailId(const LLUUID& new_thumbnail_id, const LLUUID& object_id, LLInventoryObject* obj);
+
+    enum EToolTipState
+    {
+        TOOLTIP_NONE,
+        TOOLTIP_UPLOAD_LOCAL,
+        TOOLTIP_UPLOAD_SNAPSHOT,
+        TOOLTIP_USE_TEXTURE,
+        TOOLTIP_COPY_TO_CLIPBOARD,
+        TOOLTIP_COPY_FROM_CLIPBOARD,
+        TOOLTIP_REMOVE,
+    };
+
+    void onButtonMouseEnter(LLUICtrl* button, const LLSD& param, EToolTipState state);
+    void onButtonMouseLeave(LLUICtrl* button, const LLSD& param, EToolTipState state);
+
+    bool mObserverInitialized;
+    EToolTipState mTooltipState;
+    LLUUID mItemId;
+    LLUUID mTaskId;
+    LLUUID mExpectingAssetId;
+
+    LLIconCtrl *mItemTypeIcon;
+    LLUICtrl *mItemNameText;
+    LLThumbnailCtrl *mThumbnailCtrl;
+    LLTextBox *mToolTipTextBox;
+    LLButton *mCopyToClipboardBtn;
+    LLButton *mPasteFromClipboardBtn;
+    LLButton *mRemoveImageBtn;
+
+    LLHandle<LLFloater> mPickerHandle;
+    LLHandle<LLFloater> mSnapshotHandle;
+};
+#endif  // LL_LLFLOATERCHANGEITEMTHUMBNAIL_H