From 0b15b57e63fa6ecb3eabb24db1bcf8667f9e4c0e Mon Sep 17 00:00:00 2001
From: Dmytro Maluka <dmitrymaluka@gmail.com>
Date: Sun, 18 Aug 2024 15:33:35 +0200
Subject: [PATCH] buffer: Set fastdirty=true for large file when reopening

Similarly to how we force `fastdirty` to true when opening a large file
(when creating the buffer), force it also when reopening a file, in case
the file on disk became large since we opened it.
---
 internal/buffer/buffer.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/internal/buffer/buffer.go b/internal/buffer/buffer.go
index 1d899663..3073eba0 100644
--- a/internal/buffer/buffer.go
+++ b/internal/buffer/buffer.go
@@ -550,7 +550,11 @@ func (b *Buffer) ReOpen() error {
 
 	err = b.UpdateModTime()
 	if !b.Settings["fastdirty"].(bool) {
-		calcHash(b, &b.origHash)
+		if len(data) > LargeFileThreshold {
+			b.Settings["fastdirty"] = true
+		} else {
+			calcHash(b, &b.origHash)
+		}
 	}
 	b.isModified = false
 	b.RelocateCursors()