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This now allows text view to render text with alpha values in the text foreground and backgrounds, the work is almost complete, currently the error-underline-color is still a GdkColor style property and since we use only GdkRGBA for rendering it needs to be converted and applied, probably a new rgba version of the style property should also be introduced. This commit adds tests/testtextview that must be run from the tests/ directory to show translucent text in action.
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