Logged text is not split between lines at whitespaces, if present

The bug

Due to the fix of MCL-21100, logged text now is split between lines if it otherwise would not fit on one line. However, previously, if the text contained whitespaces, the Launcher would split the text at a whitespace. Now, the text is split at the last possible character that can fit on the line, regardless of whether or not it is a whitespace.

How to reproduce

1. Ensure the "Open output log when Minecraft: Java Edition starts" option is checked
2. Start Minecraft in a version of your choice
3. Navigate to Singleplayer -> Create New World, and create a new world with cheats enabled
4. Enter the command /say @e
   Some entity names are split partway through the word, rather than at a whitespace