Use ratio for scaling mapping area instead of absolute scaling

[UnforeseenOcean]

If you maximize the window and set it so the spectrogram section takes half or so of the mapping area and then resize the window, the spectrogram will cover the entire mapping area and cannot be adjusted or used.

A solution I'm proposing is to use the ratio of the spectrogram and note view (example shown below) by calculating how much area in the X-axis each part takes up and scaling them proportionally.