Fix refreshing of transcluded functions (#7698)

* Passing test

* Failing test

* Fix test

It still fails, but now fails correctly

* Fix refreshing transcluded functions (#7755)

We store the previous result of the filter function and recalculate it
when the transclude widget needs to be refreshed, refreshing the widget
if the result is different.

---------

Co-authored-by: Jeremy Ruston <174761+Jermolene@users.noreply.github.com>
Co-authored-by: Robin Munn <rmunn@pobox.com>

editions/test/tiddlers/tests/data/transclude/Variable-Refreshing.tid

@@ -0,0 +1,27 @@
+title: Transclude/Variable/Refreshing
+description: Transcluding and refreshing a function
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Output
+
+\function list-join(filter, sep:", ") [subfilter<filter>join<sep>]
+
+<$tiddler tiddler="TestData">
+
+<<list-join "[enlist{!!items}]">>
+
+</$tiddler>
+
++
+title: TestData
+
+
++
+title: Actions
+
+<$action-setfield $tiddler="TestData" items={{{ [range[10]join[ ]] }}}/>
++
+title: ExpectedResult
+
+<p>1, 2, 3, 4, 5, 6, 7, 8, 9, 10</p>

editions/test/tiddlers/tests/data/transclude/Variable-Static.tid

@@ -0,0 +1,15 @@
+title: Transclude/Variable/Static
+description: Transcluding a function
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Output
+items: 1 2 3 4 5 6 7 8 9 10
+
+\function list-join(filter, sep:", ") [subfilter<filter>join<sep>]
+
+<<list-join "[enlist{!!items}]">>
++
+title: ExpectedResult
+
+<p>1, 2, 3, 4, 5, 6, 7, 8, 9, 10</p>