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This adds support for double underlines using the colon separated escape
sequence `CSI 4 : 2 m`.
Alacritty will now also always fallback to the normal underline in case
any of the other underlines like the undercurl are specified. The escape
sequence `CSI 4 : 0 m` can now be used to clear all underlines.
Some terminals support `CSI 21 m` for double underline, but since
Alacritty already uses that as cancel bold which is a little more
consistent, that behavior has not changed. So the colon separated
variant must be used.
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This implements the colon separated form of SGR 38 and 48.
Fixes #1485.
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Ncurses does some special handling for backspace, normally comparing it
to the KEY_BACKSPACE constant. However to make this work, the right
backspace escape sequence needs to be set in the terminfo.
XTerm has this set to ^H, but it always sends ^H. Since Alacritty
usually sends ^? instead, this needs to be specified to allow correct
interpretation for ncurses.
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