Fix #3797 (Windows 10: re git submodule usage)

Commit 8bda49d introduced the `git submodule` command into `Pantry.Repo.getRepo'`. Tests suggest that, on Windows 10, this suffers from the same upstream bug as `git clone` (see #3992 (comment) .)

This pull request proposes the same 'fix'; on Windows 10, re-enable ANSI capability after the `git submodule` command is used.

Tests on Windows 10 suggest the fix works as intended.

subs/pantry/src/Pantry/Repo.hs

@@ -101,6 +101,11 @@ getRepo' repo@(Repo url commit repoType' subdir) pm =
     withWorkingDir dir $ do
       runCommand resetArgs
       traverse_ runCommand submoduleArgs
+      -- On Windows 10, an upstream issue with the `git submodule` command means
+      -- that command clears, but does not then restore, the
+      -- ENABLE_VIRTUAL_TERMINAL_PROCESSING flag for native terminals. The
+      -- folowing hack re-enables the lost ANSI-capability.
+      when osIsWindows $ void $ liftIO $ hSupportsANSIWithoutEmulation stdout
       runCommand archiveArgs
     abs' <- resolveFile' tarball
     getArchive