Fix skipping

Author: pablogsal

src/memray/_memray/ghost_stack/src/ghost_stack.cpp

@@ -421,15 +421,6 @@ class GhostStackImpl {
         unw_init_local(&cursor, &ctx);
         LOG_DEBUG("  Initialized libunwind cursor\n");
 
-        // Skip internal frames (platform-specific due to backtrace/libunwind differences)
-#ifdef __APPLE__
-        // macOS: Skip fewer frames due to backtrace()/libunwind difference
-        for (int i = 0; i < 1 && unw_step(&cursor) > 0; ++i) {}
-#else
-        // Linux: Skip internal frames (this function + backtrace)
-        for (int i = 0; i < 3 && unw_step(&cursor) > 0; ++i) {}
-#endif
-
         // Process frames: read current frame, then step to next
         // Note: After skip loop, cursor is positioned AT the first frame we want
         // We need to read first, then step (not step-then-read)

src/memray/_memray/tracking_api.h

@@ -197,7 +197,7 @@ class NativeTrace
             d_data.resize(d_data.size() * 2);
         }
         d_size = size > skip ? size - skip : 0;
-        d_skip = skip;
+        d_skip = skip + (s_use_fast_unwind ? 2 : 0);
         return d_size > 0;
     }