Steps to reproduce

1. Open https://meta.wikimedia.org/wiki/Community_Wishlist_Survey_2022/Results.
2. Look at the Tickets column.

Actual result

3. The column is very wide, because there are no spaces after the commas in the tasks list.

Expected result

3. There are spaces after the commas.

Investigation results

1. This page uses Template:Int with the parameter comma-separator, which in turn uses Module:Int.
2. Module:Int loads the named MediaWiki message. Its content is , , i.e. an ASCII comma followed by an ASCII space.
3. Then it passes the loaded message to frame:preprocess.
4. rELUA includes/Engines/LuaCommon/LuaEngine.php normalizes the line endings. Before 91232499 (@thiemowmde), it was done with str_replace( [ "\r\n", "\r" ], "\n", $input ), now it calls TextContent::normalizeLineEndings.
5. TextContent::normalizeLineEndings does almost the same as the previous code, with the only difference being that it does an rtrim() on its input before feeding it to str_replace(). And this is where trailing space gets lost.

I suggest to revert this part of 91232499. There may be on-wiki workarounds, but since it was just a refactoring commit, with no indications for fixing any bugs, the easiest is to just revert the regression.