Nyall Dawson b168b20516 Add setting to control background color for elevation profile charts
This option (available from the new Settings - Options - Elevation tab)
allows users to set a specific color to use as the background color
for elevation profiles. This can make the chart more readable for
certain datasets, eg point clouds with RGB coloring, where the default
background color is too close to the point colors to be discernable.

This is an opt-in setting -- by default the profiles will continue
to display using the standard system background color.
2023-09-13 10:17:01 +02:00
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