[#1183] Bugfix: Prevent MissingParameterException thrown when subcommand has required options and help option is specified on parent command

Closes #1183

Author: remkop

RELEASE-NOTES.md

@@ -118,6 +118,7 @@ only single-value types, and the values in a `Map` (but not the keys!) can be wr
 * [#1229] Bugfix: Fix compilation error introduced with fc5ef6de6 (#1184). Thanks to [Andreas Deininger](https://github.com/deining) for the pull request.
 * [#1225] Bugfix: Error message for unmatched positional argument reports incorrect index when value equals a previously matched argument. Thanks to [Vitaly Shukela](https://github.com/vi) for raising this.
 * [#1250] Bugfix: Inherited positional parameter should not be overridden by default value if placed after subcommand. Thanks to [Daniel Gray](https://github.com/danielthegray) for the pull request.
+* [#1183] Bugfix: Prevent `MissingParameterException` thrown when subcommand has required options and help option is specified on parent command. Thanks to [drkilikil](https://github.com/drkilikil) for raising this.
 * [#1215] DOC: User manual improvements, including more tabs with Kotlin source code. Thanks to [Andreas Deininger](https://github.com/deining) for the pull request.
 * [#1219] DOC: User manual improvements: added more tabs with Kotlin code. Thanks to [Andreas Deininger](https://github.com/deining) for the pull request.
 * [#1220] DOC: User manual improvements: corrections, more Kotlin tabs. Thanks to [Andreas Deininger](https://github.com/deining) for the pull request.

src/main/java/picocli/CommandLine.java

@@ -12619,7 +12619,13 @@ private void parse(List<CommandLine> parsedCommands, Stack<String> argumentStack
                 }
             } while (!argumentStack.isEmpty() && continueOnError);
 
-            if (!isAnyHelpRequested()) {
+            boolean anyHelpRequested = isAnyHelpRequested();
+            CommandLine parsed = CommandLine.this;
+            while (parsed.getParent() != null) {
+                parsed = parsed.getParent();
+                anyHelpRequested |= parsed.interpreter.isAnyHelpRequested();
+            }
+            if (!anyHelpRequested) {
                 validateConstraints(argumentStack, required, initialized);
             }
         }

src/test/java/picocli/SubcommandTests.java

@@ -2736,7 +2736,6 @@ class InhSub {
         assertEquals("An inheritable parameter rooted in a subcommand's root was not itself!", subParamRooted, subsubParamFromSub.root());
     }
 
-    @Ignore("requires #1183")
     @Test
     public void testIssue1183_HelpWithSubcommandWithRequiredOptions() {
         @Command(name = "app", mixinStandardHelpOptions = true)