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python/demos/demo_waveform_plot.py: also set x limits

--- a/python/demos/demo_waveform_plot.py

+++ b/python/demos/demo_waveform_plot.py

@@ -36,6 +36,7 @@

     return ax

 def set_xlabels_sample2time(ax, latest_sample, samplerate):

+    ax.axis(xmin = 0, xmax = latest_sample)

     if latest_sample / float(samplerate) > 60:

         ax.set_xlabel('time (mm:ss)')

         ax.set_xticklabels([ "%02d:%02d" % (t/float(samplerate)/60, (t/float(samplerate))%60) for t in ax.get_xticks()[:-1]], rotation = 50)