Fails when plugins are absorbed (via git submodule absorbgitdirs)

[rwe]

If your ~/.vim/plugged or similar is contained in another repo (for example, a dotfiles repo); and you've added the plugins as submodules in order to track their updates in that repo; then you may want to use git submodule absorbgitdirs.

If you do that, Vim-Plug will break because absorbgitdirs replaces the .git/ directory with a flat file containing a path like ../../.git/modules/some-plugin/, but Vim-Plug explicitly references a folder in the command git config -f .git/config remote.origin.url.

The existing pull request #858 would fix this, among the other issues it would fix (#470, #834). This issue is opened in support of that PR, and as a record for other troubleshooters.

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NVIM v0.3.8
Build type: Release
LuaJIT 2.0.5
Compilation: /usr/local/Homebrew/Library/Homebrew/shims/mac/super/clang -Wconversion -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DNDEBUG -DMIN_LOG_LEVEL=3 -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wimplicit-
fallthrough -Wvla -fstack-protector-strong -fdiagnostics-color=auto -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -I/tmp/neovim-20190704-11886-1ukicoc/neovim-0.3.8/build/config -I/tmp/
neovim-20190704-11886-1ukicoc/neovim-0.3.8/src -I/usr/local/include -I/usr/local/opt/gettext/include -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include -I/tmp/neovim-20190704-
11886-1ukicoc/neovim-0.3.8/build/src/nvim/auto -I/tmp/neovim-20190704-11886-1ukicoc/neovim-0.3.8/build/include
Compiled by [email protected]

Features: +acl +iconv +jemalloc +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/local/Cellar/neovim/0.3.8/share/nvim"

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[kxxdhdn]

I use stow + Github to synchronize my dotfiles. The .vim/plugged/ is thus inside a git repo and the vim command PlugInstall fails to resolve the Github url. I install plugins with git submodule add under this directory and later it works fine with both PlugUpdate in vim and git submodule update for git.
Just a question: how can we modify the vim-plug script to auto select git clone or git submodule add for PlugInstall command? Thanks for your attention.