From 352fd2be223bd1b12adb8abf3dc74651c89f9394 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6ran=20Karl?=
 <3951388+JoeKar@users.noreply.github.com>
Date: Sun, 21 Jul 2024 21:20:29 +0200
Subject: [PATCH] buffer/settings: On `fastdirty` off set to on in case of
 "large file"

This behavior is then aligned to the actual documentation of `fastdirty`.
Additionally set the origHash to zero in case the buffer was already modified.
---
 internal/buffer/settings.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/internal/buffer/settings.go b/internal/buffer/settings.go
index aa011240..0af90ff8 100644
--- a/internal/buffer/settings.go
+++ b/internal/buffer/settings.go
@@ -1,6 +1,8 @@
 package buffer
 
 import (
+	"crypto/md5"
+
 	"github.com/zyedidia/micro/v2/internal/config"
 	"github.com/zyedidia/micro/v2/internal/screen"
 )
@@ -13,7 +15,12 @@ func (b *Buffer) SetOptionNative(option string, nativeValue interface{}) error {
 			if !b.Modified() {
 				e := calcHash(b, &b.origHash)
 				if e == ErrFileTooLarge {
-					b.Settings["fastdirty"] = false
+					b.Settings["fastdirty"] = true
+				}
+			} else {
+				b.origHash = [md5.Size]byte{}
+				if b.Size() > LargeFileThreshold {
+					b.Settings["fastdirty"] = true
 				}
 			}
 		}