buffer/settings: Prevent setting of unchanged option

Author: JoeKar

internal/buffer/settings.go

@@ -2,12 +2,17 @@ package buffer
 
 import (
 	"crypto/md5"
+	"reflect"
 
 	"github.com/zyedidia/micro/v2/internal/config"
 	"github.com/zyedidia/micro/v2/internal/screen"
 )
 
 func (b *Buffer) SetOptionNative(option string, nativeValue interface{}) error {
+	if reflect.DeepEqual(b.Settings[option], nativeValue) {
+		return nil
+	}
+
 	b.Settings[option] = nativeValue
 
 	if option == "fastdirty" {