From fb279cada4798c88e2d0cf295b6a6edf8355708b Mon Sep 17 00:00:00 2001
From: Martin <laz.git@mfriebe.de>
Date: Thu, 25 Jan 2024 12:49:19 +0100
Subject: [PATCH] SynEdit: prevent fold-view CalculateMaps assert during
 destroy. Once the handle is destroyed, the HL will scan delayed. Issue #40720

---
 components/synedit/synedit.pp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/components/synedit/synedit.pp b/components/synedit/synedit.pp
index 4950c33647..87c8dd4040 100644
--- a/components/synedit/synedit.pp
+++ b/components/synedit/synedit.pp
@@ -8968,6 +8968,8 @@ begin
   FreeAndNil(BufferBitmap);
   {$ENDIF}
   SurrenderPrimarySelection;
+  if FFoldedLinesView <> nil then
+    FFoldedLinesView.LinesInWindow := -1; // Mark as "not HandleAllocated"
   inherited DestroyWnd;
 end;