Improve stability of QgsTask::waitForFinished test

Author: m-kuhn

python/core/qgstaskmanager.sip

@@ -175,6 +175,8 @@ class QgsTask : QObject
  Blocks the current thread until the task finishes or a maximum of ``timeout`` milliseconds.
  If the ``timeout`` is ``-1`` the thread will be blocked forever.
  In case of a timeout, the task will still be running.
+ In case the task already is finished, the method will return immediately while
+ returning ``true``.
 
  The result will be false if the wait timed out and true in any other case.
  :rtype: bool

src/core/qgstaskmanager.cpp

@@ -158,6 +158,8 @@ bool QgsTask::waitForFinished( int timeout )
     connect( &timer, &QTimer::timeout, &loop, &QEventLoop::quit );
   }
 
+  if ( status() == QgsTask::Complete || status() == QgsTask::Terminated )
+    return true;
   loop.exec();
 
   return rv;

src/core/qgstaskmanager.h

@@ -190,6 +190,8 @@ class CORE_EXPORT QgsTask : public QObject
      * Blocks the current thread until the task finishes or a maximum of \a timeout milliseconds.
      * If the \a timeout is ``-1`` the thread will be blocked forever.
      * In case of a timeout, the task will still be running.
+     * In case the task already is finished, the method will return immediately while
+     * returning ``true``.
      *
      * The result will be false if the wait timed out and true in any other case.
      */

tests/src/core/testqgstaskmanager.cpp

@@ -671,7 +671,6 @@ void TestQgsTaskManager::waitForFinished()
   QTimer timer;
   connect( &timer, &QTimer::timeout, finishedTask, &ProgressReportingTask::finish );
   timer.start( 100 );
-  QCOMPARE( finishedTask->status(), QgsTask::Running );
   QCOMPARE( finishedTask->waitForFinished(), true );
   QCOMPARE( finishedTask->status(), QgsTask::Complete );
 
@@ -683,7 +682,6 @@ void TestQgsTaskManager::waitForFinished()
 
   connect( &timer, &QTimer::timeout, failedTask, &ProgressReportingTask::terminate );
   timer.start( 100 );
-  QCOMPARE( failedTask->status(), QgsTask::Running );
   QCOMPARE( failedTask->waitForFinished(), true );
   QCOMPARE( failedTask->status(), QgsTask::Terminated );
 
@@ -695,7 +693,6 @@ void TestQgsTaskManager::waitForFinished()
 
   connect( &timer, &QTimer::timeout, timeoutTooShortTask, &ProgressReportingTask::finish );
   timer.start( 1000 );
-  QCOMPARE( timeoutTooShortTask->status(), QgsTask::Running );
   QCOMPARE( timeoutTooShortTask->waitForFinished( 20 ), false );
   QCOMPARE( timeoutTooShortTask->status(), QgsTask::Running );
 }