Revert "refactor(options): set option value for non-current context directly" (#31924)

Reverts #31112

src/nvim/option_defs.h

@@ -81,12 +81,6 @@ typedef struct {
   OptValData data;
 } OptVal;
 
-/// Context that an option is being set for.
-typedef struct {
-  win_T *win;
-  buf_T *buf;
-} OptCtx;
-
 /// :set operator types
 typedef enum {
   OP_NONE = 0,
@@ -128,7 +122,8 @@ typedef struct {
   /// length of the error buffer
   size_t os_errbuflen;
 
-  OptCtx os_ctx;
+  void *os_win;
+  void *os_buf;
 } optset_T;
 
 /// Type for the callback function that is invoked after an option value is
@@ -197,12 +192,3 @@ typedef struct {
   OptVal def_val;                    ///< default value
   LastSet last_set;                  ///< script in which the option was last set
 } vimoption_T;
-
-/// Execute code with autocmd context
-#define WITH_AUCMD_CONTEXT(ctx, code) \
-  do { \
-    aco_save_T _aco; \
-    aucmd_prepbuf_win(&_aco, ctx.buf, ctx.win); \
-    code; \
-    aucmd_restbuf(&_aco); \
-  } while (0)