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render: optionally enable heuristics that deal with private usage area chars

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Try to detect double-width *glyphs* for single-width *characters*, and
allow them to overflow into the next cell.

This is only done for single-width chars with a glyph width that is at
least 1.5 cells wide, but at most 3 cells.

The feature is gated by the new
‘tweak.allow-overflowing-double-width-glyphs’, and is disabled by
default.

Closes #116
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Daniel Eklöf 2020-09-03 17:37:44 +02:00
parent bb8d9378c9
commit b71016c25d
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@ -45,6 +45,10 @@
Ps r` (https://codeberg.org/dnkl/foot/issues/91).
* `$COLORTERM` is now set to `truecolor` at startup, to indicate
support for 24-bit RGB colors.
* Experimental support for rendering double-width glyphs with a
character width of 1. Must be explicitly enabled with
`tweak.allow-overflowing-double-width-glyphs`
(https://codeberg.org/dnkl/foot/issues/116).
### Deprecated