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Text used only Cantarell with Noto Emoji as fallback, so characters such as the back arrow (U+2190), the unsaved dot (U+25CF), the remove cross (U+2715) and Markdown's replacement character (U+FFFD) were drawn as empty boxes. Every text face (regular, bold, monospace) now falls back, in order, to emoji, Noto Sans Symbols 2, Noto Sans Math and Noto Sans for U+FFFD. The Noto fonts are subset to the arrow, math, technical, shape, dingbat and symbol blocks to keep them small (about 300 KB together) and ship under the OFL like the existing fonts. The face and fallback lists now live in one header, CanvasFonts.hpp, which the canvas loads and a new FontCoverage test reads: the test scans every non-ASCII character written in the Widgets and Taskboard sources and fails if any text face cannot draw it through the fallback chain.
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../../../Graphics/rsc/FontSymbols.ttf |