fix: edge case where window options were not set

lua/oil/init.lua

@@ -742,6 +742,10 @@ M.setup = function(opts)
         if has_orig and vim.api.nvim_buf_is_valid(orig_buffer) then
           vim.fn.setreg("#", orig_buffer)
         end
+        if not vim.w.oil_did_enter then
+          require("oil.view").set_win_options()
+          vim.w.oil_did_enter = true
+        end
       elseif vim.fn.isdirectory(bufname) == 0 then
         -- Only run this logic if we are *not* in an oil buffer (and it's not a directory, which
         -- will be replaced by an oil:// url)

tests/win_options_spec.lua

@@ -57,4 +57,16 @@ a.describe("window options", function()
     vim.cmd.edit({ args = { "README.md" } })
     assert.equals("auto", vim.o.signcolumn)
   end)
+
+  a.it("Sets the window options when re-entering oil buffer", function()
+    oil.open()
+    test_util.wait_for_autocmd("BufReadPost")
+    assert.truthy(vim.w.oil_did_enter)
+    vim.cmd.edit({ args = { "README.md" } })
+    assert.falsy(vim.w.oil_did_enter)
+    oil.open()
+    assert.truthy(vim.w.oil_did_enter)
+    vim.cmd.vsplit()
+    assert.truthy(vim.w.oil_did_enter)
+  end)
 end)