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Plot lines sometimes draw thicker than expected #53

Description

@K4HEZ

Symptom: Some charts will sometimes show a thin line as the plot is drawn, but then immediately 'thicken' up after the end of the scan.

Underlying: Previous efforts used a slightly thicker line to highlight the current selected measurement from the other measurements. Since a new (or loaded) measurement becomes "currently selected" the code thickens its line. Which has a bad preset value. The setting is not exposed today, but there was also once a pair of "unselected" and "selected" measurement line width settings that didn't merge forward.

Other efforts used 'dotted' lines and transparency when S21 plots overlapped (as they generally do). Abandoned. as it caused orange lines that didn't appear in the color legend.

CURRENT Methodology: Use Z-order to bring the selected measurement ahead of the other measurements. The legend will change to match the current selected measurement to show the colors of the lines brought forward.

Question: Do we also want the two settings restored to control the line width(s)? Also, do we want more color control and line style settings? Leaning toward former, and not the latter.

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