ReadTreeThreeWay will perform a three-way merge on the trees stage1, stage2, and stage3. In a normal merge, stage1 is the common ancestor, stage2 is "our" changes, and stage3 is "their" changes. See git-read-tree(1) for details. If options.DryRun is not false, it will also be written to the Client'
(c *Client, opt ReadTreeOptions, stage1, stage2, stage3 Treeish)
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