patch 9.0.2086: code cleanup for option callbacks needed

Commit: 
https://github.com/vim/vim/commit/deba02ddd46e9e8adfe2f7800c6be19d8c8e1a4d
Author: zeertzjq <[email protected]>
Date:   Thu Nov 2 21:01:19 2023 +0100

    patch 9.0.2086: code cleanup for option callbacks needed
    
    Problem:  code cleanup for option callbacks needed
    Solution: remove flag os_doskip, it's not necessary, as we can check,
              whether an error message was returned
    
    Remove unnecessary field os_doskip
    
    Callback functions for boolean options set os_doskip immediately before
    returning an error message, so os_doskip isn't actually needed.
    
    closes: #13461
    
    Signed-off-by: zeertzjq <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/src/option.c b/src/option.c
index 35529a576..d5d20d767 100644
--- a/src/option.c
+++ b/src/option.c
@@ -3680,7 +3680,6 @@ did_set_modifiable(optset_T *args UNUSED)
                    && curbuf->b_term != NULL && !term_is_finished(curbuf))))
     {
        curbuf->b_p_ma = FALSE;
-       args->os_doskip = TRUE;
        return e_cannot_make_terminal_with_running_job_modifiable;
     }
 # endif
@@ -3942,7 +3941,6 @@ did_set_previewwindow(optset_T *args)
        if (win->w_p_pvw && win != curwin)
        {
            curwin->w_p_pvw = FALSE;
-           args->os_doskip = TRUE;
            return e_preview_window_already_exists;
        }
 
@@ -4130,7 +4128,6 @@ did_set_termguicolors(optset_T *args UNUSED)
            !has_vtp_working())
     {
        p_tgc = 0;
-       args->os_doskip = TRUE;
        return e_24_bit_colors_are_not_supported_on_this_environment;
     }
     if (is_term_win32())
@@ -4602,7 +4599,7 @@ set_bool_option(
        args.os_newval.boolean = value;
        args.os_errbuf = NULL;
        errmsg = options[opt_idx].opt_did_set_cb(&args);
-       if (args.os_doskip)
+       if (errmsg != NULL)
            return errmsg;
     }
 
diff --git a/src/structs.h b/src/structs.h
index 36968741e..4e081b860 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -4948,10 +4948,6 @@ typedef struct
        char_u  *string;
     } os_newval;
 
-    // When set by the called function: Stop processing the option further.
-    // Currently only used for boolean options.
-    int                os_doskip;
-
     // Option value was checked to be safe, no need to set P_INSECURE
     // Used for the 'keymap', 'filetype' and 'syntax' options.
     int                os_value_checked;
diff --git a/src/version.c b/src/version.c
index e136a671e..83ac9db56 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2086,
 /**/
     2085,
 /**/

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