refactor(git): pull buffer-placement tail into util.place_buf

lua/git/object.lua

@@ -286,15 +286,7 @@ local function open_uri(worktree, uri, sha, opts, default_ft)
     if default_ft and vim.bo[buf].filetype == "" then
         vim.bo[buf].filetype = default_ft
     end
-    local split = opts and opts.split
-    if split == false then
-        vim.cmd.normal({ "m'", bang = true })
-        vim.api.nvim_set_current_buf(buf)
-        return
-    end
-    vim.api.nvim_open_win(buf, true, {
-        split = split or (vim.o.splitbelow and "below" or "above"),
-    })
+    util.place_buf(buf, opts and opts.split)
 end
 
 ---Open a commit's body via `git cat-file -p` for the header (raw object
@@ -313,14 +305,7 @@ function M.open_commit(worktree, ref, opts)
     local name = util.uri(sha)
     local existing = vim.fn.bufnr(name)
     if existing ~= -1 and vim.api.nvim_buf_is_loaded(existing) then
-        if split == false then
-            vim.cmd.normal({ "m'", bang = true })
-            vim.api.nvim_set_current_buf(existing)
-        else
-            vim.api.nvim_open_win(existing, true, {
-                split = split or (vim.o.splitbelow and "below" or "above"),
-            })
-        end
+        util.place_buf(existing, split)
         return
     end