Strip trailing whitespace for diff-based regressions

Author: bmunguia

TestCases/TestCase.py

@@ -386,6 +386,9 @@ def run_filediff(self, with_tsan=False, with_asan=False, with_tapetests=False):
 
                         # If file tolerance is set to 0, make regular diff
                         if self.tol_file_percent == 0.0:
+                            # Strip trailing whitespace but keep newline for difflib
+                            fromlines = [line.rstrip() + '\n' for line in fromlines]
+                            tolines = [line.rstrip() + '\n' for line in tolines]
                             diff = list(difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate))
 
                         # Else test word by word with given tolerance