Merge pull request #4712 from willmmiles/2d-expansion-fadeout-fix

Fix Segment::fade_out for 2d expansion

wled00/FX.h

@@ -723,6 +723,13 @@ class Segment {
       return 1;
     #endif
     }
+    inline unsigned rawLength() const {   // returns length of used raw pixel buffer (eg. get/setPixelColorRaw())
+    #ifndef WLED_DISABLE_2D
+      if (is2D()) return virtualWidth() * virtualHeight();
+    #endif
+      return virtualLength();    
+    }
+
   #ifndef WLED_DISABLE_2D
     inline bool is2D() const                                                            { return (width()>1 && height()>1); }
     [[gnu::hot]] void setPixelColorXY(int x, int y, uint32_t c) const; // set relative pixel within segment with color