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Add scale method option for layout scale bars #58904

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Add scale method option for layout scale bars #58904

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Commits on Sep 30, 2024

  1. Add scale method option for layout scale bars 

    Instead of always calculating the scale along the bottom of the
map, expose a choice of methods to the user (along bottom,
middle, top, or average of the three measurements)

For new scalebars, default to the average method, which better
handles the scenario where the scale at the top or bottom of
the map cannot be calculated (eg when the top/bottom of the map
falls just outside valid areas for the map's crs)

This fixes one of the most common scenarios which cause scale
bar widths to blow out to massive sizes

Refs qgis#55240
    @nyalldawson
    nyalldawson committed Sep 30, 2024
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  2. Test mask updates

    @nyalldawson
    nyalldawson committed Sep 30, 2024
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