Prevent vanished players from being in plot kick autocompletion (#4485)

Author: PapiCapi

Core/src/main/java/com/plotsquared/core/command/Kick.java

@@ -153,7 +153,7 @@ public Collection<Command> tab(final PlotPlayer<?> player, final String[] args,
         if (plot == null) {
             return Collections.emptyList();
         }
-        return TabCompletions.completePlayersInPlot(plot, String.join(",", args).trim(),
+        return TabCompletions.completePlayersInPlot(player, plot, String.join(",", args).trim(),
                 Collections.singletonList(player.getName())
         );
     }

Core/src/main/java/com/plotsquared/core/util/TabCompletions.java

@@ -107,6 +107,7 @@ private TabCompletions() {
     }
 
     public static @NonNull List<Command> completePlayersInPlot(
+            final @NonNull PlotPlayer<?> issuer,
             final @NonNull Plot plot,
             final @NonNull String input, final @NonNull List<String> existing
     ) {
@@ -115,7 +116,9 @@ private TabCompletions() {
             final List<PlotPlayer<?>> inPlot = plot.getPlayersInPlot();
             players = new ArrayList<>(inPlot.size());
             for (PlotPlayer<?> player : inPlot) {
-                players.add(player.getName());
+                if (issuer.canSee(player)) {
+                    players.add(player.getName());
+                }
             }
             cachedCompletionValues.put("inPlot" + plot, players);
         }