vcl: fix event processing to idle - for JUnit tests.

Change-Id: Ibeb1f6627815fc34c6e166357c88e076b75f6abb
Reviewed-on: https://gerrit.libreoffice.org/20197Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>

include/vcl/scheduler.hxx

@@ -92,8 +92,10 @@ public:
     static void CallbackTaskScheduling( bool ignore );
     /// Calculate minimum timeout - and return its value.
     static sal_uInt64 CalculateMinimumTimeout( bool &bHasActiveIdles );
-    /// Process one pending task ahead of time with highhest priority.
-    static void       ProcessTaskScheduling( bool bTimer );
+    /// Process one pending task ahead of time with highest priority.
+    static bool       ProcessTaskScheduling( bool bTimerOnly );
+    /// Process all events until we are idle
+    static void       ProcessEventsToIdle();
 };
 
 #endif // INCLUDED_VCL_SCHEDULER_HXX

toolkit/source/awt/vclxtoolkit.cxx

@@ -1912,7 +1912,7 @@ void SAL_CALL VCLXToolkit::processEventsToIdle()
     throw (css::uno::RuntimeException, std::exception)
 {
     SolarMutexGuard aSolarGuard;
-    Scheduler::ProcessTaskScheduling(false);
+    Scheduler::ProcessEventsToIdle();
 }
 
 OUString SAL_CALL VCLXToolkit::getHWOSConfInfo()

vcl/source/app/scheduler.cxx

@@ -157,7 +157,7 @@ void Scheduler::CallbackTaskScheduling(bool ignore)
     Scheduler::ProcessTaskScheduling( false );
 }
 
-void Scheduler::ProcessTaskScheduling( bool bTimerOnly )
+bool Scheduler::ProcessTaskScheduling( bool bTimerOnly )
 {
     ImplSchedulerData* pSchedulerData;
 
@@ -168,6 +168,23 @@ void Scheduler::ProcessTaskScheduling( bool bTimerOnly )
 
         pSchedulerData->mnUpdateTime = tools::Time::GetSystemTicks();
         pSchedulerData->Invoke();
+        return true;
+    }
+    else
+        return false;
+}
+
+void Scheduler::ProcessEventsToIdle()
+{
+    // FIXME: really we should process incoming OS events too ...
+    int nSanity = 1000;
+    while (Scheduler::ProcessTaskScheduling(false))
+    {
+        if (nSanity-- < 0)
+        {
+            SAL_WARN("vcl.schedule", "Unexpected volume of events to process");
+            break;
+        }
     }
 }