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main: verify primary font is monospaced at startup

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Load a couple of ASCII glyphs and check if their advance widths
matches. If not, warn the user that the font is probably not
monospaced.

This can be disabled by setting tweak.font-monospace-warn=no.

Closes #704.
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Daniel Eklöf 2021-08-31 19:42:22 +02:00
parent bb948d03e1
commit 8ffc556d44
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11
doc/foot.ini.5.scd
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@ -1022,6 +1022,17 @@ any of these options.
Default: _double-width_
*font-monospace-warn*
Boolean. When enabled, foot will use heuristics to try to verify
the primary font is a monospace font, and warn if it is not.
Disable this if you still want to use the font, even if foot
thinks it is not monospaced.
You may also want to disable it to get slightly faster startup times.
Default: _yes_
*max-shm-pool-size-mb*
This option controls the amount of virtual address space used by
the pixmap memory to which the terminal screen content is