Add keyboard shortcut for changing history length #1423
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Changing the history length of the buffered visualizers for high-frequency waveforms is a common operation for monitoring signals over longer time periods. The only way to do it interactively is currently through the UI of the
MatVisualizer, by right-clicking the window to bring up the status bar, then selecting a small arrow drop-down at the bottom-right corner and changing a number by hand in a text box.This PR simplifies this operation by introducing a keyboard shortcut (
Ctrl + PlusandCtrl + Minusrespectively) to step up and down history length by 1. HoldingCtrl + Shift + PlusorCtrl + Shift + Minuswill increase/decrease the history length by 10.