fix: data loss bug when move + delete (#162)

lua/oil/mutator/init.lua

@@ -191,7 +191,7 @@ M.enforce_action_order = function(actions)
   local function get_deps(action)
     local ret = {}
     if action.type == "delete" then
-      return ret
+      src_trie:accum_children_of(action.url, ret)
     elseif action.type == "create" then
       -- Finish operating on parents first
       -- e.g. NEW /a BEFORE NEW /a/b

tests/mutator_spec.lua

@@ -409,6 +409,19 @@ a.describe("mutator", function()
       assert.are.same({ create, move }, ordered_actions)
     end)
 
+    it("Moves file out of parent before deleting parent", function()
+      local move = {
+        type = "move",
+        src_url = "oil-test:///a/b.txt",
+        dest_url = "oil-test:///b.txt",
+        entry_type = "file",
+      }
+      local delete = { type = "delete", url = "oil-test:///a", entry_type = "directory" }
+      local actions = { delete, move }
+      local ordered_actions = mutator.enforce_action_order(actions)
+      assert.are.same({ move, delete }, ordered_actions)
+    end)
+
     it("Handles parent child move ordering", function()
       -- move parent into a child and child OUT of parent
       --     MOVE /a/b -> /b