Workaround colors on newlines of string flags issue in text lib.

Also fix newline lookbehind replacement, and only replace color macros
in string flags.

worldguard-core/src/main/java/com/sk89q/worldguard/commands/CommandUtils.java

@@ -24,7 +24,9 @@
 import com.sk89q.worldedit.util.formatting.text.serializer.legacy.LegacyComponentSerializer;
 
 import javax.annotation.Nullable;
+import java.util.Arrays;
 import java.util.function.Function;
+import java.util.stream.Collectors;
 
 /**
  * Command-related utility methods.
@@ -76,7 +78,12 @@ public static String replaceColorMacros(String str) {
         str = str.replace("`x", "&r");
 
         // MC classic
-        str = LegacyComponentSerializer.INSTANCE.serialize(LegacyComponentSerializer.INSTANCE.deserialize(str, '&'));
+        // FIXME: workaround for https://github.com/KyoriPowered/text/issues/50
+        // remove when fixed upstream and updated in WorldEdit
+        str = Arrays.stream(str.split("\n")).map(line -> {
+            TextComponent comp = LegacyComponentSerializer.INSTANCE.deserialize(line, '&');
+            return LegacyComponentSerializer.INSTANCE.serialize(comp);
+        }).collect(Collectors.joining("\n"));
 
         return str;
     }

worldguard-core/src/main/java/com/sk89q/worldguard/commands/region/RegionCommands.java

@@ -500,11 +500,6 @@ public void flag(CommandContext args, Actor sender) throws CommandException {
             value = "";
         }
 
-        // Add color codes
-        if (value != null) {
-            value = CommandUtils.replaceColorMacros(value);
-        }
-
         // Lookup the existing region
         RegionManager manager = checkRegionManager(world);
         ProtectedRegion existing = checkExistingRegion(manager, args.getString(0), true);
@@ -572,7 +567,7 @@ public void flag(CommandContext args, Actor sender) throws CommandException {
         if (value != null) {
             // Set the flag if [value] was given even if [-g group] was given as well
             try {
-                setFlag(existing, foundFlag, sender, value);
+                value = setFlag(existing, foundFlag, sender, value).toString();
             } catch (InvalidFlagFormat e) {
                 throw new CommandException(e.getMessage());
             }

worldguard-core/src/main/java/com/sk89q/worldguard/commands/region/RegionCommandsBase.java

@@ -392,8 +392,10 @@ protected static void setPlayerSelection(LocalPlayer player, ProtectedRegion reg
      * @param value the value
      * @throws InvalidFlagFormat thrown if the value is invalid
      */
-    protected static <V> void setFlag(ProtectedRegion region, Flag<V> flag, Actor sender, String value) throws InvalidFlagFormat {
-        region.setFlag(flag, flag.parseInput(FlagContext.create().setSender(sender).setInput(value).setObject("region", region).build()));
+    protected static <V> V setFlag(ProtectedRegion region, Flag<V> flag, Actor sender, String value) throws InvalidFlagFormat {
+        V val = flag.parseInput(FlagContext.create().setSender(sender).setInput(value).setObject("region", region).build());
+        region.setFlag(flag, val);
+        return val;
     }
 
 }

worldguard-core/src/main/java/com/sk89q/worldguard/protection/flags/StringFlag.java

@@ -19,6 +19,8 @@
 
 package com.sk89q.worldguard.protection.flags;
 
+import com.sk89q.worldguard.commands.CommandUtils;
+
 import javax.annotation.Nullable;
 
 /**
@@ -56,7 +58,10 @@ public String getDefault() {
 
     @Override
     public String parseInput(FlagContext context) throws InvalidFlagFormat {
-        return context.getUserInput().replaceAll("(?!<\\\\)\\\\n", "\n").replaceAll("\\\\\\\\n", "\\n");
+        String lines = context.getUserInput().replaceAll("(?<!\\\\)\\\\n", "\n").replaceAll("\\\\\\\\n", "\\\\n");
+        // Add color codes
+        lines = CommandUtils.replaceColorMacros(lines);
+        return lines;
     }
 
     @Override