Merge pull request #15003 from rmcdermo/master

Git: ignore any directory with UNTRACKED in title when doing git clea…

Author: rmcdermo

.gitignore

@@ -104,3 +104,13 @@ Verification/Timing_Benchmarks/t*.fds
 CMakeUserPresets.json
 Build/cmakeb/
 .vscode/
+
+# Anything stored in your repo with UNTRACKED in its directory name
+# will not be wiped out if you do `git clean -dXf` (note capital X!)
+
+# Ignore any directory that has "UNTRACKED" in its name, recursively
+*UNTRACKED*/
+
+# Ignore everything under such directories
+*UNTRACKED*/**
+