From eb8f69dd038562adbc941b95a8125ff880010e6d Mon Sep 17 00:00:00 2001
From: Jeremy Ruston <jeremy@jermolene.com>
Date: Mon, 19 Jan 2026 12:52:58 +0000
Subject: [PATCH] =?UTF-8?q?Merge=20subfilter=20fix=20from=C2=A0#9595?=
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---
 core/modules/filters.js           | 11 +++++++----
 core/modules/filters/subfilter.js |  4 +++-
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/core/modules/filters.js b/core/modules/filters.js
index 7c8cb21ba..57009afad 100644
--- a/core/modules/filters.js
+++ b/core/modules/filters.js
@@ -230,8 +230,8 @@ exports.getFilterRunPrefixes = function() {
 	return this.filterRunPrefixes;
 }
 
-exports.filterTiddlers = function(filterString,widget,source) {
-	var fn = this.compileFilter(filterString);
+exports.filterTiddlers = function(filterString,widget,source,options) {
+	var fn = this.compileFilter(filterString,options);
 	try {
 		const fnResult = fn.call(this,source,widget);
 		return fnResult;
@@ -244,8 +244,11 @@ exports.filterTiddlers = function(filterString,widget,source) {
 Compile a filter into a function with the signature fn(source,widget) where:
 source: an iterator function for the source tiddlers, called source(iterator), where iterator is called as iterator(tiddler,title)
 widget: an optional widget node for retrieving the current tiddler etc.
+options: optional hashmap of options
+	options.defaultFilterRunPrefix: the default filter run prefix to use when none is specified
 */
-exports.compileFilter = function(filterString) {
+exports.compileFilter = function(filterString,options) {
+	var defaultFilterRunPrefix = options?.defaultFilterRunPrefix || "or";
 	if(!this.filterCache) {
 		this.filterCache = Object.create(null);
 		this.filterCacheCount = 0;
@@ -354,7 +357,7 @@ exports.compileFilter = function(filterString) {
 			var options = {wiki: self, suffixes: operation.suffixes || []};
 			switch(operation.prefix || "") {
 				case "": // No prefix means that the operation is unioned into the result
-					return filterRunPrefixes["or"](operationSubFunction, options);
+					return filterRunPrefixes[defaultFilterRunPrefix](operationSubFunction, options);
 				case "=": // The results of the operation are pushed into the result without deduplication
 					return filterRunPrefixes["all"](operationSubFunction, options);
 				case "-": // The results of this operation are removed from the main result
diff --git a/core/modules/filters/subfilter.js b/core/modules/filters/subfilter.js
index 5e35f7cd1..c7853798e 100644
--- a/core/modules/filters/subfilter.js
+++ b/core/modules/filters/subfilter.js
@@ -13,7 +13,9 @@ Filter operator returning its operand evaluated as a filter
 Export our filter function
 */
 exports.subfilter = function(source,operator,options) {
-	var list = options.wiki.filterTiddlers(operator.operand,options.widget,source);
+	var suffixes = operator.suffixes || [],
+		defaultFilterRunPrefix = (suffixes[0] || [])[0] || "or";
+	var list = options.wiki.filterTiddlers(operator.operand,options.widget,source,{defaultFilterRunPrefix});
 	if(operator.prefix === "!") {
 		var results = [];
 		source(function(tiddler,title) {