use matched filter for determining warning title

fixes a bug where, when multiple filters apply, the
WarningFilteredStatusDisplayItem would not check if the warning applies to the
current context. now, matched filter is determined through the predicate
(though not exactly what a predicate is supposed to do, i guess) and passed
down to the WarningFilteredStatusDisplayItem. cc @LucasGGamerM

mastodon/src/main/java/org/joinmastodon/android/utils/StatusFilterPredicate.java

@@ -6,6 +6,7 @@ import org.joinmastodon.android.model.Status;
 
 import java.time.Instant;
 import java.util.List;
+import java.util.Optional;
 import java.util.function.Predicate;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -14,6 +15,7 @@ public class StatusFilterPredicate implements Predicate<Status>{
 	private final List<Filter> filters;
 	private final Filter.FilterContext context;
 	private final Filter.FilterAction action;
+	private Filter applyingFilter;
 
 	/**
 	 * @param context null makes the predicate pass automatically
@@ -58,18 +60,26 @@ public class StatusFilterPredicate implements Predicate<Status>{
 	public boolean test(Status status){
 		if (context == null) return true;
 
-		Stream<Filter> stream = status.filtered != null
+		Stream<Filter> matchingFilters = status.filtered != null
 				// use server-provided per-status info (status.filtered) if available
 				? status.filtered.stream().map(f -> f.filter)
 				// or fall back to cached filters
 				: filters.stream().filter(filter -> filter.matches(status));
 
-		return stream
+		Optional<Filter> applyingFilter = matchingFilters
 				// discard expired filters
 				.filter(filter -> filter.expiresAt == null || filter.expiresAt.isAfter(Instant.now()))
 				// only apply filters for given context
 				.filter(filter -> filter.context.contains(context))
 				// treating filterAction = null (from filters list) as FilterAction.HIDE
-				.noneMatch(filter -> filter.filterAction == null ? action == Filter.FilterAction.HIDE : filter.filterAction == action);
+				.filter(filter -> filter.filterAction == null ? action == Filter.FilterAction.HIDE : filter.filterAction == action)
+				.findAny();
+
+		this.applyingFilter = applyingFilter.orElse(null);
+		return applyingFilter.isEmpty();
+	}
+
+	public Filter getApplyingFilter() {
+		return applyingFilter;
 	}
 }