As a product of enabling the write of separate LineIDs (described here https://github.com/tcunit/TcUnit/issues/85) and having a discussion with Beckhoff support, it was concluded that the files "LineIDs.dbg" and "LineIDs.dbg.bak" should not be version controlled, and thus these two are added to the gitignore-file for TwinCAT3.

TwinCAT3.gitignore

@@ -17,6 +17,8 @@
 *.project.~u
 *.tsproj.bak
 *.xti.bak
+LineIDs.dbg
+LineIDs.dbg.bak
 _Boot/
 _CompileInfo/
 _Libraries/