fix: light accent run on --restoreHEADmaster

A restore puts back what the last session showed, which with keystone's
wallpaper engine on is usually a timer tick. Ticks run udt-accent light
(UDT_ROTATION), leaving GRUB, the homepage and SDDM on the engine's home
wallpaper. The login restore ran it full on the tick's image instead, so
every boot rebuilt the GRUB and homepage themes and posted their root
steps to the desktop.

Before the engine, the restored wallpaper had always had its full run
already, so the light run loses nothing there either. A set still runs
it full.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2 files changed, 21 insertions, 1 deletions

diff --git a/tests/wallp.bats b/tests/wallp.bats
index 8a092d4..fff5c84 100644
--- a/tests/wallp.bats
+++ b/tests/wallp.bats
@@ -181,6 +181,22 @@ EOS
   grep -q "swaybg -o DP-3 -i $HOME/saved_v.png" "$HOME/calls.log"
 }
 
+@test "restore runs udt-accent light, a set runs it full" {
+  cat > "$STUB_DIR/udt-accent" <<'EOS'
+#!/bin/bash
+echo "rotation=${UDT_ROTATION:-}" >> "$HOME/accent.log"
+EOS
+  chmod +x "$STUB_DIR/udt-accent"
+  CONF_OUTPUT_H="DP-1"; CONF_OUTPUT_V="DP-3"
+  : > "$HOME/dh.png"; : > "$HOME/dv.png"
+  CONF_DEFAULT_H="$HOME/dh.png"; CONF_DEFAULT_V="$HOME/dv.png"
+  do_restore
+  [ "$(cat "$HOME/accent.log")" = "rotation=1" ]
+  : > "$HOME/accent.log"
+  finalize
+  [ "$(cat "$HOME/accent.log")" = "rotation=" ]
+}
+
 @test "restore falls back to conf defaults" {
   CONF_OUTPUT_H="DP-1"; CONF_OUTPUT_V="DP-3"
   : > "$HOME/dh.png"; : > "$HOME/dv.png"
diff --git a/wallp b/wallp
index 694d2b2..f2e8214 100755
--- a/wallp
+++ b/wallp
@@ -195,7 +195,11 @@ do_restore() {
     file="$(restore_path_for "$logical")"
     apply_output "$logical" "$file" || true
   done
-  finalize
+  # A restore puts back what the last session showed, which may be a
+  # wallpaper engine tick: GRUB, the homepage and SDDM were deliberately left
+  # on the engine's home, so the light run keeps them there. A full run here
+  # rebuilt both and posted their root steps on every login.
+  UDT_ROTATION=1 finalize
 }
 
 finalize() {