refactor/single-include: undo_defs.h

src/nvim/CMakeLists.txt

@@ -542,7 +542,6 @@ set(NO_SINGLE_CHECK_HEADERS
   os/win_defs.h
   os/pty_process_win.h
   undo.h
-  undo_defs.h
 )
 foreach(hfile ${NVIM_HEADERS})
   get_test_target(test-includes "${hfile}" relative_path texe)

src/nvim/undo_defs.h

@@ -4,9 +4,10 @@
 #include <time.h>  // for time_t
 
 #include "nvim/pos.h"
-#include "nvim/buffer_defs.h"
 #include "nvim/mark_defs.h"
 
+typedef struct u_header u_header_T;
+
 /* Structure to store info about the Visual area. */
 typedef struct {
   pos_T vi_start;               /* start pos of last VIsual */
@@ -15,8 +16,9 @@ typedef struct {
   colnr_T vi_curswant;          /* MAXCOL from w_curswant */
 } visualinfo_T;
 
+#include "nvim/buffer_defs.h"
+
 typedef struct u_entry u_entry_T;
-typedef struct u_header u_header_T;
 struct u_entry {
   u_entry_T   *ue_next;         /* pointer to next entry in list */
   linenr_T ue_top;              /* number of line above undo block */