patch 9.0.1745: Missing test coverage for blockwise Visual highlight Commit: https://github.com/vim/vim/commit/fc3058495d3ff58c8f2b9dd4452d0840f2d1fa42 Author: zeertzjq <zeertzjq@outlook.com> Date: Sat Aug 19 13:27:03 2023 +0200 patch 9.0.1745: Missing test coverage for blockwise Visual highlight Problem: Missing test coverage for blockwise Visual highlight with virtual that starts with a double-width char. Solution: Add a new virtual text to the test. Some other small fixes. closes: #12835 Signed-off-by: Christian Brabandt <cb@256bit.org> Co-authored-by: zeertzjq <zeertzjq@outlook.com>