removed submodules shown as untracked when switching branches

[Mike Friedrich <mfriedrich@kns.com>]

Hi,

When switching clean branches I see untracked files appearing where I expect to see "nothing to commit, working tree clean".
This happens when submodules get removed on one branch but its present in another.
I expect git to either not mark the submodule in git status as untracked or git to remove the submodule as it would for ordinary tracked files which do not exist on a branch anymore.

Tested on Windows with: git version 2.15.1.windows.2
Tested on Ubuntu Linux with same output: git version 2.14.1

Test:
    git init test
    git init submodule
    cd submodule
    touch file.txt
    git add file.txt
    git commit -m "test"
    cd ../test
    touch initial.txt
    git add initial.txt
    git commit -m "initial"
    git checkout -b develop
    git status
    #On branch develop
    #nothing to commit, working tree clean

    git submodule add ../submodule sub
    git add sub
    git commit -m "submodule added"
    git status
    #On branch develop
    #nothing to commit, working tree clean

    git checkout master
    git status
    #On branch master
    #Untracked files:
    #  (use "git add <file>..." to include in what will be committed)
    #
    #        sub/
    #
    #nothing added to commit but untracked files present (use "git add" to track)
    # expected: nothing to commit, working tree clean

    git submodule update
    # (no output)
    git submodule
    # (no output)
    git status
    #On branch master
    #Untracked files:
    #  (use "git add <file>..." to include in what will be committed)
    #
    #        sub/
    #
    #nothing added to commit but untracked files present (use "git add" to track)
    # expected: nothing to commit, working tree clean

    git clean -dfx
    #Skipping repository sub/

Best Regards,
Mike Friedrich


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