Add 'git submodule sync --recursive' to PlugUpdate

[mschlaeffer]

Some plugins use several nested git submodules (e.g. YouCompleteMe). If the URL of one of these submodules changes, PlugUpdate fails. Also git submodule update --init --recursive fails in the command line in this case:

error: Server does not allow request for unadvertised object ... Fetched in submodule path '...', but it did not contain .... Direct fetching of that commit failed. Failed to recurse into submodule path '...'

The fix is to call git submodule sync --recursive prior to git submodule update --init --recursive in PlugUpdate.

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• Type:
  • [x] Bug
  • [ ] Enhancement
  • [ ] Feature Request
  • [ ] Question
• OS:
  • [x] All/Other
  • [ ] Linux
  • [ ] OS X
  • [ ] Windows
• Vim:
  • [x] Terminal Vim
  • [x] GVim
  • [x] Neovim

[pinggit]

exactly. another example is pymode