dont remove block items that are filler (#1846)

CHANGELOG.md

@@ -53,6 +53,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   - Language codes where an English name cannot be found will be at the bottom of the list
 - Fix local libraries to detect external subtitle files with unrecognized language codes
 - Fix playback selection of subtitles with unrecognized language codes
+- Fix incorrectly removing block items that are hidden from EPG when deco filler is applied
 
 ### Changed
 - Remove some unnecessary API calls related to media server scanning and paging

ErsatzTV.Core/Scheduling/BlockScheduling/BlockPlayoutFillerBuilder.cs

@@ -25,7 +25,10 @@ public class BlockPlayoutFillerBuilder(
         if (mode is PlayoutBuildMode.Reset)
         {
             // remove all playout items with type filler
-            var toRemove = playout.Items.Where(pi => pi.FillerKind is not FillerKind.None).ToList();
+            // except block items that are hidden from the guide (guide mode)
+            var toRemove = playout.Items
+                .Where(pi => pi.FillerKind is not FillerKind.None and not FillerKind.GuideMode)
+                .ToList();
             foreach (PlayoutItem playoutItem in toRemove)
             {
                 BlockPlayoutChangeDetection.RemoveItemAndHistory(playout, playoutItem);