This ensures we always have a valid (but possibly incorrect) scaling
value. This allows us to simplify code that uses the scale - it
doesn't have to verify the scale if valid.
Furthermore, since render_resize() is the function that actually
updates term->scale, make sure to call it *before* updating the
cursor (otherwise, the cursor will use the old scaling value).
This makes -f,--font behave just like the configuration file option
'font'; the first font in the list is the primary font, and the
remaining fonts are fallback fonts used when a glyph cannot be found
in the primary font.
They where previously identical to the corresponding 'regular'
colors. Now, we've done a saturated add with 0x202020 (which seems to
be roughly the difference between the other regular and bright
colors).
This fixes an issue where sometimes the strikeout thickness where
truncated to 0 (e.g. Cascadia Code).
Note that we already do this for the underline calculations.
We now use two timers for delayed rendering; one _lower_ limit timeout
that is reset each time we receive input from the slave. We never
render *before* this timeout. Since it's reset, this means rendering
may be pushed further into the future.
To prevent this from happening indefinitely, the second timer defines
the _upper_ limit. This timer is only reset after rendering.
Thus, slave input may now increase the rendering delay, but only up to
a certain limit.
The lower limit is as before, 1ms. The upper limit is set to 16ms (the
time between frame updates on a 60HZ output).
Only a color space ID of '2' means the sequence is an RGB
sequence. Update existing code to verify this, and ignore sequences
with other color space IDs.
Except color space ID '5', which is the same as a regular 38;5;<idx>
sequence, but using sub-parameters instead (38:2:5:<idx>).
Use the 'yellow' color from the 'regular' range of colors (SGR 33) for
background when we have a match, or 'red' from the 'regular' range of
colors (SGR 31) when we don't have a match.
Foreground uses the 'black' color from the regular range of
colors (SGR 30).
