QmlProfiler: Don't ignore ranges of < 500ns in overview

As most of the numbers involved are single precision floats rounding
errors can easily lead to such numbers. Instead of ignoring it set the
range to the smallest allowable value.

Task-number: QTCREATORBUG-11879
Change-Id: If8d08b27cc9e4cf2a63ff4973f519b0d3363178d
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

src/plugins/qmlprofiler/qml/Overview.qml

@@ -55,9 +55,8 @@ Canvas {
             return;
         var newStartTime = Math.round(rangeMover.getLeft() * qmlProfilerModelProxy.traceDuration() / width) + qmlProfilerModelProxy.traceStartTime();
         var newEndTime = Math.round(rangeMover.getRight() * qmlProfilerModelProxy.traceDuration() / width) + qmlProfilerModelProxy.traceStartTime();
-        if ((startTime !== newStartTime || endTime !== newEndTime) && newEndTime - newStartTime > 500) {
-            zoomControl.setRange(newStartTime, newEndTime);
-        }
+        if (startTime !== newStartTime || endTime !== newEndTime)
+            zoomControl.setRange(newStartTime, Math.max(newEndTime, newStartTime + 500));
     }
 
     function clamp(val, min, max) {