One of my projects has a sub folder called "tags". As it looks like, this folder is ignored by git although I've not defined it in my .gitignore file.
So I guess there is a list of "keywords" like "tags" that is ignored by git on default?
Here is the content of the .gitignore file
# Java: https://github.com/github/gitignore/blob/master/Java.gitignore
*.class
**/classes/
# Package Files #
*.jar
*.war
*.ear
# IDEA: https://github.com/github/gitignore/blob/master/Global/IntelliJ.gitignore
*.iml
*.ipr
*.iws
.idea/
# Mac OS X: https://github.com/github/gitignore/blob/master/Global/OSX.gitignore
.DS_Store
.AppleDouble
Icon
# Thumbnails
._*
# Files that might appear on external disk
.Spotlight-V100
.Trashes
# Gradle
.gradle/
**/build/
out/
# Leiningen and others
**/target/
tags is a good candidate for a global ignore rule because of its use by the ctags command.
ctags generates an index of identifiers in your source code and writes them to a file called tags, which vi uses to quickly jump to the definition of the identifier under your cursor when you press ^]. For this reason, lots of source directories tend to contain a tags file that is not of interest to version control.
Do you have a global ignore file set up? An answer to this question suggests:
git config --get core.excludesfile
to find out.
And reading further down the answers in that other question: also $XDG_CONFIG_HOME/git/ignore and $HOME/.config/git/ignore