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Refactor TerminalDispatch (graphics) to match AdaptDispatch (#6728)
This is essentially a rewrite of the `TerminalDispatch::SetGraphicsRendition` method, bringing it into closer alignment with the `AdaptDispatch` implementation, simplifying the `ITerminalApi` interface, and making the code easier to extend. It adds support for a number of attributes which weren't previously implemented. REFERENCES * This is a mirror of the `AdaptDispatch` refactoring in PR #5758. * The closer alignment with `AdaptDispatch` is a small step towards solving issue #3849. * The newly supported attributes should help a little with issues #5461 (italics) and #6205 (strike-through). DETAILS I've literally copied and pasted the `SetGraphicsRendition` implementation from `AdaptDispatch` into `TerminalDispatch`, with only few minor changes: * The `SetTextAttribute` and `GetTextAttribute` calls are slightly different in the `TerminalDispatch` version, since they don't return a pointless `success` value, and in the case of the getter, the `TextAttribute` is returned directly instead of by reference. Ultimately I'd like to move the `AdaptDispatch` code towards that way of doing things too, but I'd like to deal with that later as part of a wider refactoring of the `ConGetSet` interface. * The `SetIndexedForeground256` and `SetIndexedBackground256` calls required the color indices to be remapped in the `AdaptDispatch` implementation, because the conhost color table is in a different order to the XTerm standard. `TerminalDispatch` doesn't have that problem, so doesn't require the mapping. * The index color constants used in the 16-color `SetIndexedForeground` and `SetIndexedBackground` calls are also slightly different for the same reason. VALIDATION I cherry-picked this code on top of the #6506 and #6698 PRs, since that's only way to really get the different color formats passed-through to the terminal. I then ran a bunch of manual tests with various color coverage scripts that I have, and confirmed that all the different color formats were being rendered as expected. Closes #6725
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