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A canvas is just a canvas. Move WaveView into its own library.
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make libwidget independent of libcanvas.
Confine basics to pbd and gtkmm2ext.
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Items no longer need a parent group (they require a Canvas pointer instead), so all constructors have been rationalized
and have two variants, one with a parent and one with a canvas.
All Items now inherit from Fill and Outline, to banish diagonal inheritance and virtual base classes and all that.
There were zero changes to the Ardour GUI arising from these changes.
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issues with outlines
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content-dragging, colors, and more
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renderings of themselves can invalidate those caches when colors etc. change; add Item::{begin,end}_visual_change() so that we can notify the canvas more efficiently when *only* visual properties have changed and not the bounding box (probably needs to be used more widely)
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development, but it is just a distraction - we will NEVER be saving or restoring canvas state via XML or any kind of serialized state
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correctly
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