From 338b7c92a2df38a8d389f9f1cbc8e4dcd7ea6ebd Mon Sep 17 00:00:00 2001
From: "jeremy@jermolene.com" <jeremy@jermolene.com>
Date: Sun, 27 Jun 2021 21:27:57 +0100
Subject: [PATCH] Ensure tiddlers with fieldnames containing colons don't get
 saved in .tid file format

Prompted by discussion over at https://github.com/Jermolene/TiddlyWiki5/pull/5708#issuecomment-862399985
---
 core/modules/utils/filesystem.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/core/modules/utils/filesystem.js b/core/modules/utils/filesystem.js
index 25392e738..265cbd86f 100644
--- a/core/modules/utils/filesystem.js
+++ b/core/modules/utils/filesystem.js
@@ -228,6 +228,7 @@ exports.generateTiddlerFileInfo = function(tiddler,options) {
 			hasUnsafeFields = hasUnsafeFields || /[\x00-\x1F]/mg.test(value);
 			hasUnsafeFields = hasUnsafeFields || ($tw.utils.trim(value) !== value);
 		}
+		hasUnsafeFields = hasUnsafeFields || /:/mg.test(fieldName);
 	});
 	// Check for field values 
 	if(hasUnsafeFields) {