SH-4458 SH-3652 FIX Pants flare does not load properly upon an avatar returning

Viewer added a new callback when the avatar returned without resetting the
timer for last reference to the saved raw image. This created a time window
in which new callbacks could get cleared out due to the raw image getting destroyed.

Since the callback was removed, pants flare was not properly applied. Appears
to be working now.

indra/newview/llviewertexture.cpp

@@ -2169,6 +2169,7 @@ void LLViewerFetchedTexture::setLoadedCallback( loaded_callback_func loaded_call
 		}
 	}
 	mLastCallBackActiveTime = sCurrentTime ;
+        mLastReferencedSavedRawImageTime = sCurrentTime;
 }
 
 void LLViewerFetchedTexture::clearCallbackEntryList()

indra/newview/llvoavatar.cpp

@@ -6316,6 +6316,8 @@ void LLVOAvatar::updateMeshTextures()
 				// we'll consider it loaded and use it (rather than
 				// doing compositing).
 				useBakedTexture( baked_img->getID() );
+                                mLoadedCallbacksPaused |= !isVisible();
+                                checkTextureLoading();
 			}
 			else
 			{
@@ -6331,6 +6333,7 @@ void LLVOAvatar::updateMeshTextures()
 
                                // this could add paused texture callbacks
                                mLoadedCallbacksPaused |= paused; 
+                               checkTextureLoading();
 			}
 		}
 		else if (layerset && isUsingLocalAppearance())