Avoid accumulating a huge number of Trace Events before calling the callback

Don't use only the five second timer to flush the buffer. Set a limit
on the number of accumulated events, too.

Change-Id: I075028ce653d89cf099d91ce0d4d97c1361a3bb4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/118089
Tested-by: Jenkins
Reviewed-by: Tor Lillqvist <tml@collabora.com>

desktop/source/lib/init.cxx

@@ -210,7 +210,13 @@ public:
         SetTimeout(dumpTimeoutMS);
         Start();
     }
+
     virtual void Invoke() override
+    {
+        flushRecordings();
+    }
+
+    static void flushRecordings()
     {
         const css::uno::Sequence<OUString> aEvents =
             comphelper::TraceEvent::getRecordingAndClear();
@@ -3905,6 +3911,7 @@ static void lo_setOption(LibreOfficeKit* /*pThis*/, const char *pOption, const c
     {
         if (strcmp(pValue, "start") == 0)
         {
+            comphelper::TraceEvent::setBufferSizeAndCallback(100, TraceEventDumper::flushRecordings);
             comphelper::TraceEvent::startRecording();
             if (traceEventDumper == nullptr)
                 traceEventDumper = new TraceEventDumper();