Debug assertion failure "cannot seek vector iterator after end" in RTensor.hxx

[bellenot]

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Description

This code in RTensor.hxx:

      shape.insert(shape.end() + 1 + idx, 1);

generates a debug assertion failure "cannot seek vector iterator after end".
As explained in the standard: end() returns an iterator to the element following the last element of the vector. This element acts as a placeholder; attempting to access it results in undefined behavior.

Reproducer

Compile ROOT in Debug mode on Windows with the /RTC1 compiler flag and run the TMVA tests/tutorials

ROOT version

master (6.29/01)

Installation method

built from source

Operating system

Windows

Additional context

No response

[bellenot]

@moneta maybe simply shape.push_back(1); instead of shape.insert(shape.end() + 1 + idx, 1); would do it?