MAINT-8382 FIXED “Zoom back” button is displayed after selecting other nearby media

indra/newview/llpanelnearbymedia.cpp

@@ -1047,7 +1047,7 @@ void LLPanelNearByMedia::updateControls()
 			else {
 				showBasicControls(!impl->isMediaDisabled(), 
 								  ! impl->isParcelMedia(),  // include_zoom
-								  LLViewerMediaFocus::getInstance()->isZoomed(),
+								  LLViewerMediaFocus::getInstance()->isZoomedOnMedia(impl->getMediaTextureID()),
 								  impl->getVolume() == 0.0,
 								  impl->getVolume());
 			}

indra/newview/llviewermediafocus.cpp

@@ -82,7 +82,7 @@ void LLViewerMediaFocus::setFocusFace(LLPointer<LLViewerObject> objectp, S32 fac
 	if (media_impl.notNull() && objectp.notNull())
 	{
 		bool face_auto_zoom = false;
-
+		mPrevFocusedImplID = LLUUID::null;
 		mFocusedImplID = media_impl->getMediaTextureID();
 		mFocusedObjectID = objectp->getID();
 		mFocusedObjectFace = face;
@@ -403,6 +403,7 @@ void LLViewerMediaFocus::update()
 			else
 			{
 				// Someone else has focus -- back off.
+				mPrevFocusedImplID = mFocusedImplID;
 				clearFocus();
 			}
 		}
@@ -602,6 +603,15 @@ bool LLViewerMediaFocus::isZoomed() const
 	return (mMediaControls.get() && mMediaControls.get()->getZoomLevel() != LLPanelPrimMediaControls::ZOOM_NONE);
 }
 
+bool LLViewerMediaFocus::isZoomedOnMedia(LLUUID media_id)
+{
+	if (isZoomed())
+	{
+		return (mFocusedImplID == media_id) || (mPrevFocusedImplID == media_id);
+	}
+	return false;
+}
+
 LLUUID LLViewerMediaFocus::getControlsMediaID()
 {
 	if(getFocusedMediaImpl())

indra/newview/llviewermediafocus.h

@@ -83,6 +83,7 @@ public:
 	void focusZoomOnMedia(LLUUID media_id);
 	// Are we zoomed in?
 	bool isZoomed() const;
+	bool isZoomedOnMedia(LLUUID media_id);
 	void unZoom();
 	
 	// Return the ID of the media instance the controls are currently attached to (either focus or hover).
@@ -104,6 +105,7 @@ private:
 	LLUUID mFocusedObjectID;
 	S32 mFocusedObjectFace;
 	LLUUID mFocusedImplID;
+	LLUUID mPrevFocusedImplID;
 	LLVector3 mFocusedObjectNormal;
 	
 	LLUUID mHoverObjectID;