Android: Fix find process and user PID recipe

Before, the loop got finished after the very first
failure of the pid command. Fix it so that the loop
stops on the first successful execution of any child.
Make timeout task return error, so that the loop
continues executing after the timeout.

Simplify some commands' constructions.

Amends a7ece15f6e

Change-Id: I637002f0248ec69e61e058c7246471396aac1142
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/android/androidrunnerworker.cpp

@@ -628,17 +628,15 @@ void AndroidRunnerWorker::asyncStart()
     using namespace Tasking;
 
     const Storage<PidUserPair> pidStorage;
-    const LoopUntil iterator([pidStorage](int) { return pidStorage->first <= 0; });
 
     const FilePath adbPath = AndroidConfig::adbToolPath();
     const QStringList args = selector();
-
-    const auto onPidSetup = [adbPath, args, packageName = m_packageName,
-                             isPreNougat = m_isPreNougat](Process &process) {
-        const QString pidScript = isPreNougat
+    const QString pidScript = m_isPreNougat
         ? QString("for p in /proc/[0-9]*; do cat <$p/cmdline && echo :${p##*/}; done")
-            : QString("pidof -s '%1'").arg(packageName);
-        process.setCommand({adbPath, args + QStringList{"shell", pidScript}});
+        : QString("pidof -s '%1'").arg(m_packageName);
+
+    const auto onPidSetup = [adbPath, args, pidScript](Process &process) {
+        process.setCommand({adbPath, {args, "shell", pidScript}});
     };
     const auto onPidDone = [pidStorage, packageName = m_packageName,
                             isPreNougat = m_isPreNougat](const Process &process) {
@@ -650,8 +648,8 @@ void AndroidRunnerWorker::asyncStart()
     };
 
     const auto onUserSetup = [pidStorage, adbPath, args](Process &process) {
-        process.setCommand({adbPath, args
-            + QStringList{"shell", "ps", "-o", "user", "-p", QString::number(pidStorage->first)}});
+        process.setCommand({adbPath, {args, "shell", "ps", "-o", "user", "-p",
+                                      QString::number(pidStorage->first)}});
     };
     const auto onUserDone = [pidStorage](const Process &process) {
         const QString out = process.allOutput();
@@ -674,10 +672,11 @@ void AndroidRunnerWorker::asyncStart()
     const Group root {
         pidStorage,
         onGroupSetup([pidStorage] { *pidStorage = {-1, 0}; }),
-        Group {
-            iterator,
+        Forever {
+            stopOnSuccess,
             ProcessTask(onPidSetup, onPidDone, CallDoneIf::Success),
-            TimeoutTask([](std::chrono::milliseconds &timeout) { timeout = 200ms; })
+            TimeoutTask([](std::chrono::milliseconds &timeout) { timeout = 200ms; },
+                        [] { return DoneResult::Error; })
         }.withTimeout(45s),
         ProcessTask(onUserSetup, onUserDone, CallDoneIf::Success),
         onGroupDone([pidStorage, this] { onProcessIdChanged(*pidStorage); })