refactor: run IWYU on entire repo

Reference: https://github.com/neovim/neovim/issues/6371.

src/nvim/api/private/converter.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "nvim/api/private/defs.h"  // IWYU pragma: keep
+#include "nvim/api/private/defs.h"  // IWYU pragma: export
 #include "nvim/eval/typval_defs.h"  // IWYU pragma: keep
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS

src/nvim/api/private/dispatch.h

@@ -3,7 +3,7 @@
 #include <stdbool.h>
 #include <stdint.h>
 
-#include "nvim/api/private/defs.h"
+#include "nvim/api/private/defs.h"  // IWYU pragma: export
 #include "nvim/memory_defs.h"
 #include "nvim/types_defs.h"
 

src/nvim/api/private/helpers.h

@@ -4,7 +4,7 @@
 #include <stddef.h>
 
 #include "klib/kvec.h"
-#include "nvim/api/private/defs.h"
+#include "nvim/api/private/defs.h"  // IWYU pragma: export
 #include "nvim/buffer_defs.h"  // IWYU pragma: keep
 #include "nvim/eval/typval_defs.h"  // IWYU pragma: keep
 #include "nvim/ex_eval_defs.h"

src/nvim/api/private/validate.h

@@ -3,7 +3,7 @@
 #include <stdbool.h>
 #include <stddef.h>
 
-#include "nvim/api/private/defs.h"
+#include "nvim/api/private/defs.h"  // IWYU pragma: export
 #include "nvim/api/private/helpers.h"
 #include "nvim/assert_defs.h"
 #include "nvim/macros_defs.h"

src/nvim/api/ui.c

@@ -15,7 +15,8 @@
 #include "nvim/autocmd.h"
 #include "nvim/channel.h"
 #include "nvim/eval.h"
-#include "nvim/event/defs.h"
+#include "nvim/event/loop.h"
+#include "nvim/event/multiqueue.h"
 #include "nvim/event/wstream.h"
 #include "nvim/globals.h"
 #include "nvim/grid.h"

src/nvim/api/vim.c

@@ -64,6 +64,7 @@
 #include "nvim/statusline.h"
 #include "nvim/strings.h"
 #include "nvim/terminal.h"
+#include "nvim/types_defs.h"
 #include "nvim/ui.h"
 #include "nvim/vim_defs.h"
 #include "nvim/window.h"