feat: can restore Oil progress window when minimized

tests/manual_progress.lua

@@ -0,0 +1,28 @@
+-- Manual test for minimizing/restoring progress window
+local Progress = require("oil.mutator.progress")
+
+local progress = Progress.new()
+
+progress:show({
+  cancel = function()
+    progress:close()
+  end,
+})
+
+for i = 1, 10, 1 do
+  vim.defer_fn(function()
+    progress:set_action({
+      type = "create",
+      url = string.format("oil:///tmp/test_%d.txt", i),
+      entry_type = "file",
+    }, i, 10)
+  end, (i - 1) * 1000)
+end
+
+vim.defer_fn(function()
+  progress:close()
+end, 10000)
+
+vim.keymap.set("n", "R", function()
+  progress:restore()
+end, {})