tdf#91727 - Unwind non-dispatch of idle handlers.

This clobbers the functionality from commit:

06d731428ef6cf93c7333e8228bfb6088853b52f

make idle timers actually activate only when idle

Since now all rendering and re-sizing is done in idle handlers it
does effectively the opposite of what was intended. A better solution
would allow special-casing the processing of just rendering,
re-sizing and window management to spin for eg. progress bar
rendering.

Also add helpful debugging labels to the idle & timeouts.

Also cleanup the Idle vs. Scheduler handling.

Also ensure that starting an Idle triggers a mainloop wakeup.

Also add a unit test.

Change-Id: Ifb0756714378fdb790be599b93c7a3ac1f9209e6

1 files changed, 10 insertions, 6 deletions

diff --git a/include/vcl/scheduler.hxx b/include/vcl/scheduler.hxx
index dfa1483132b2..6c4e2116b589 100644
--- a/include/vcl/scheduler.hxx
+++ b/include/vcl/scheduler.hxx
@@ -52,23 +52,27 @@ enum class SchedulerPriority {
 class VCL_DLLPUBLIC Scheduler
 {
 protected:
-    ImplSchedulerData*  mpSchedulerData;    // Pointer to element in scheduler list
-    SchedulerPriority   mePriority;         // Scheduler priority
-    bool                mbActive;           // Currently in the scheduler
+    ImplSchedulerData*  mpSchedulerData;    /// Pointer to element in scheduler list
+    const sal_Char     *mpDebugName;        /// Useful for debugging
+    SchedulerPriority   mePriority;         /// Scheduler priority
+    bool                mbActive;           /// Currently in the scheduler
 
     friend struct ImplSchedulerData;
     virtual void SetDeletionFlags();
-    virtual bool ReadyForSchedule( bool bTimer ) { return !bTimer; }
-    virtual sal_uInt64 UpdateMinPeriod( sal_uInt64 nMinPeriod, sal_uInt64 nTime );
+    virtual bool ReadyForSchedule( bool bTimer ) = 0;
+    virtual sal_uInt64 UpdateMinPeriod( sal_uInt64 nMinPeriod, sal_uInt64 nTime ) = 0;
 
 public:
-    Scheduler();
+    Scheduler( const sal_Char *pDebugName = NULL );
     Scheduler( const Scheduler& rScheduler );
     virtual ~Scheduler();
 
     void SetPriority( SchedulerPriority ePriority );
     SchedulerPriority GetPriority() const { return mePriority; }
 
+    void            SetDebugName( const sal_Char *pDebugName ) { mpDebugName = pDebugName; }
+    const sal_Char *GetDebugName() { return mpDebugName; }
+
     // Call handler
     virtual void    Invoke() = 0;