Merge pull request #1124 from silx-kit/fix_outputbuffer_allocateRam_issue

OutputBuffer datasets cannot be the same

Author: woutdenolf

src/PyMca5/PyMcaIO/OutputBuffer.py

@@ -356,6 +356,8 @@ def _allocateRam(self, label, group=None, fill_value=None, dataAttrs=None,
         """
         if data is not None:
             buffer = numpy.asarray(data, dtype=dtype)
+            if id(buffer) in set(map(id, self._buffers.values())):
+                buffer = buffer.copy()
             if fill_value is not None:
                 buffer[:] = fill_value
         elif fill_value is None: