It was changed per commit 96bb8d2ed38df344403342439f2aa45d906748cc//saveAction->setShortcut(tr("Ctrl+S"));
I also see that a setShortcut call for Ctrl+F to be linked with the search feature has been disabled via a different commit, but I don't really care about that particular function enough to want to enable it.
Edit 1: Welp, uncommented that line and it seems to be working just fine. In fact, went ahead and inserted
Edit 2: Started messing around with TTextEdit.cpp trying to get Cmud style full-line highlighting when you click on the timestamp besides a line. Getting it to work with just single clicks was actually really easy, but getting it to work when dragging across multiple lines proving to be a bit tougher. It works dragging upwards through lines currently, but I'm having a hard time figuring out how to change