Add advanced search canned filter for "tiddlers modified this session"

core/language/en-GB/Filters.multids

@@ -10,6 +10,7 @@ Orphans: Orphan tiddlers
 SystemTiddlers: System tiddlers
 ShadowTiddlers: Shadow tiddlers
 OverriddenShadowTiddlers: Overridden shadow tiddlers
+SessionTiddlers: Tiddlers modified since the wiki was loaded
 SystemTags: System tags
 StoryList: Tiddlers in the story river, excluding <$text text="$:/AdvancedSearch"/>
 TypedTiddlers: Non wiki-text tiddlers

core/ui/Filters/SessionTiddlers.tid

@@ -0,0 +1,5 @@
+title: $:/core/Filters/SessionTiddlers
+tags: $:/tags/Filter
+filter: [haschanged[]]
+description: {{$:/language/Filters/SessionTiddlers}}
+