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Bug in MidiKeyboardComponent

General JUCE discussion
#1

MidiKeyboardComponent::xyToNote rounds the Point<float> passed in using Point::toInt, as in the following code:

if (! reallyContains (pos.toInt (), false))
return -1;

However, when this method is called via mouseExit->updateNoteUnderMouse->xyToNote, this sometimes causes the keyboard to think the mouse is still within the component bounds due to the position being inaccurately rounded. This issue is solved as follows:

if (! reallyContains (pos.roundToInt (), false))
return -1;