Allow more easily customisable scrollbar glyphs #4505
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Closes #4500
This allows a user to easily customise scrollbar display. For example, when using the Consolas font, scrollbars display poorly:
By reducing the characters to those supported, the display is more consistent:
By using some lightly shaded characters, the scrollbars gain some flair:
The blank glyph can also be replaced:
This is easier than replacing the entire
ScrollBarRender.render_bar
function.