build: clear 5 warning categories across 19 sites (#15628)

src/libslic3r/PrintObject.cpp

@@ -1635,7 +1635,9 @@ bool PrintObject::invalidate_step(PrintObjectStep step)
 bool PrintObject::invalidate_all_steps()
 {
 	// First call the "invalidate" functions, which may cancel background processing.
-    bool result = Inherited::invalidate_all_steps() | m_print->invalidate_all_steps();
+    const bool inherited_invalidated = Inherited::invalidate_all_steps();
+    const bool print_invalidated     = m_print->invalidate_all_steps();
+    bool result = inherited_invalidated || print_invalidated;
 	// Then reset some of the depending values.
 	m_slicing_params.valid = false;
 	return result;