assert.m: Preallocate string for pretty printing The string being used for pretty printing assertion failures was being grown sequentially. In certain cases such as the BISTs for `conv2`, printing known failures was taking several minutes, especially when compiled without compiler optimization flags. This patch uses preallocation, leading to some 7x to 14x speedup. See https://octave.discourse.group/t/conv2-test-time-rather-long/5446/9

root = true

[*]
charset = utf-8
end_of_line = lf
indent_size = 2
indent_style = space
insert_final_newline = true

[*.{am,mk}]
indent_size = tab
indent_style = tab