I couldn’t find an elegant way to change it. I hope the Gitlab authors release new update with this feature. By now, I touch precompiled css file.
‘tab-size:4;’ sets default tab space as 4. You need to find a proper place for it. (Chrome editor mode will lead you to a css file named ‘application-HASH_VALUE.css’.) Go to your gitlab directory and edit the file. After then, run gzip -kf application-HASH_VALUE.css to update application-HASH_VALUE.css.gz . (Usually, the NGINX is configured to serve compressed css file by default.)
+ You may need to touch two places in that file. One for file browsing window and the other for diff window.
+ The patch will be blown up when you re-compile the asset.