I have two branches :
- master
- feature-x
In the project, I have a temp folder.
This folder is in .gitignore
While being in master, I created a file hamburger.txt inside the temp folder. 
Then I switched branch for feature-x.
The file hamburger.txt disappeared. 
Then I switch back to master. The hamburger has disappeared definitely. 
Why ? How can I get it back ?
I thought the files / folders in .gitignore were completely ignored by git. How switching branch could make the file disappear ?
 
    