git 2.5 gained native support for worktrees, so let's use them.

Since this is fairly new I don't think we should switch the general
dim setup over to using it (for e.g. the maintainer-tools and other
auxiliary branches) since 2.5 was only released July 2015.

Signed-off-by: Daniel Vetter <[email protected]>
---
 dim | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dim b/dim
index e30fc84a8567..854b5a61b399 100755
--- a/dim
+++ b/dim
@@ -556,7 +556,14 @@ function create_workdir
 
                echo Creating separate workdir for $branch
 
-               $DRY git-new-workdir ${DIM_DRM_INTEL} $branch $branch
+               if git help worktree &> /dev/null; then
+                       # native worktree support was added in git 2.5
+                       cd $DIM_DRM_INTEL
+                       $DRY git worktree add $DIM_PREFIX/$branch $branch
+                       cd $DIM_PREFIX
+               else
+                       $DRY git-new-workdir $DIM_DRM_INTEL $branch $branch
+               fi
        done
 }
 
-- 
2.6.4

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