silx.gui.plot.PlotWidget: Added support of line style defined as (offset, (dash pattern))
#4020
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This PR adds support in both
PlotWidget
backends of line style as(offset, (dash pattern))
the same way matploltib Line2D supports it.Previous string based styles (e.g., '--', '-.') are still supported.
related to #4005 and #4010, follow up of #4015
This still need some tests.