From 187849a6a91bfc9aaac5253a0cc180c81827b08c Mon Sep 17 00:00:00 2001
From: Jeremy Ruston <jeremy@jermolene.com>
Date: Wed, 22 Jul 2026 17:36:20 +0100
Subject: [PATCH] Fix palette fallback wrongly treating shadow palettes as
 missing

The is[missing] operator returns true for shadow tiddlers, so the fallback
introduced for missing palettes made every plugin palette compile as Vanilla
---
 core/wiki/macros/CSS.tid                      |  2 +-
 .../data/palettes/ShadowPaletteCompile.tid    | 22 +++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 editions/test/tiddlers/tests/data/palettes/ShadowPaletteCompile.tid

diff --git a/core/wiki/macros/CSS.tid b/core/wiki/macros/CSS.tid
index 3a029c877..a031e5112 100644
--- a/core/wiki/macros/CSS.tid
+++ b/core/wiki/macros/CSS.tid
@@ -81,7 +81,7 @@ tags: $:/tags/Macro
 
 \procedure actions-recompile-current-palette()
 \procedure tv-action-refresh-policy() always
-<$transclude $variable="actions-compile-palette" inputPalette={{{ [{$:/palette}!is[missing]] :else[[$:/palettes/Vanilla]] }}} outputPalette="$:/temp/palette-colours"/>
+<$transclude $variable="actions-compile-palette" inputPalette={{{ [{$:/palette}is[tiddler]] [{$:/palette}is[shadow]] :else[[$:/palettes/Vanilla]] }}} outputPalette="$:/temp/palette-colours"/>
 \end actions-recompile-current-palette
 
 \procedure tv-palette-name() $:/temp/palette-colours
diff --git a/editions/test/tiddlers/tests/data/palettes/ShadowPaletteCompile.tid b/editions/test/tiddlers/tests/data/palettes/ShadowPaletteCompile.tid
new file mode 100644
index 000000000..7c3568011
--- /dev/null
+++ b/editions/test/tiddlers/tests/data/palettes/ShadowPaletteCompile.tid
@@ -0,0 +1,22 @@
+title: Operators/Palettes/ShadowPaletteCompile
+description: A shadow palette from a plugin compiles as itself, not the Vanilla fallback
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Output
+
+\import [subfilter{$:/core/config/GlobalImportFilter}]
+(<<colour background>>)
++
+title: Actions
+
+\import [subfilter{$:/core/config/GlobalImportFilter}]
+<<actions-recompile-current-palette>>
++
+title: $:/palette
+
+$:/palettes/TwentyTwenties
++
+title: ExpectedResult
+
+<p>(#FFFCF0)</p>
\ No newline at end of file