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sixel: don’t *ever* shrink image below its SRA size

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If the image was accompanied with a “Set Raster Attributes” (SRA)
command, make sure we *never* shrink the image below the size
specified in the SRA.

Images are normally shrunk when their bottom rows are fully
transparent. This enables sixels that aren’t a multiple of 6 to be
emitted, without also emitting an SRA command.

But if there *is* an SRA command, obey it.

Verified against XTerm-367
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Daniel Eklöf 2021-05-16 10:57:43 +02:00
parent 92e517ae34
commit e0f1a4ae33
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2 changed files with 8 additions and 6 deletions
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@ -101,6 +101,8 @@
* Font underlines being positioned below the cell (and thus being
invisible) for certain combinations of fonts and font sizes
(https://codeberg.org/dnkl/foot/issues/503).
* Sixels with transparent bottom border being resized below the size
specified in _”Set Raster Attributes”_.
### Security