Cut & paste from vi, despite different orientations, are identical.

```Build started at 2020-12-28T05:05:48.710538
Main binary: /usr/bin/python3
Build Options:
Python system: Linux
The Meson build system
Version: 0.54.2
Source dir: /media/usb/polkit-d
Build dir: /media/usb/polkit-d/build
Build type: native build
None of 'PKG_CONFIG_PATH' are defined in the envi
None of 'PKG_CONFIG_PATH' are defined in the envi
Project name: polkit-d
Project version: 0.1.1
None of 'CC' are defined in the environment, not
None of 'CFLAGS' are defined in the environment,
None of 'LDFLAGS' are defined in the environment,
None of 'CPPFLAGS' are defined in the environment
None of 'CC_LD' are defined in the environment, n
None of 'DC' are defined in the environment, not
None of 'DFLAGS' are defined in the environment,
None of 'LDFLAGS' are defined in the environment,
None of 'DC_LD' are defined in the environment, n
None of 'D_LD' are defined in the environment, no

../meson.build:3:0: ERROR: Unable to determine dy
~

The payload names no vi source file or test; its only code reference is meson.build:3, within a failed build log. Start by reproducing the cut-and-paste behavior and locating the relevant vi implementation and tests; done means the two orientations no longer produce identical results.

Written by the indexing model from the issue text.