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This commit fixes an issue where the prompt symbol is white when vcs_info is displayed in the gentoo theme.

This commit fixes an issue in the gentoo theme introduced in 3bb5e977

.
Due to incorrect line width calculations, colors are incorrectly applied
when using tab.

Fixes #9778
Signed-off-by: Thomas De Backer <mosterdt@debacker.me>

* prettify vcs infomation using `vcs_info`

* Show symbol when there are untracked files in git
Co-authored-by: freeyoung <ourbaozi@qq.com>

%_ is a prompt expansion sequence that expands to the status of the parser.
This means that on window resize, the status of the execution of the
window resize hook (TRAPWINCH) would be displayed while reloading the
prompt line. This looked like cmdand cursh$ or then$ depending on the
body of the TRAPWINCH function.

Fixes #7262