X11 error when running GUI

[ortk95]

See https://planetmapper.readthedocs.io/en/latest/common_issues.html#planetmapper-crashes-when-running-graphical-user-interface-over-ssh for details of how to fix this issue.

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X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  45 (X_OpenFont)
  Value in failed request:  0x60027c
  Serial number of failed request:  3572
  Current serial number in output stream:  3573

[ortk95]

Seems to be related to XQuartz/XQuartz#216 so may not be a planetmapper issue directly

[ortk95]

Appears to be triggered by using symbols with highish unicode code points e.g. ↑ and ↺. Could therefore add a fallback mode to use ASCII symbols instead e.g. ^ and CCW.

This is (hopefully) a temporary bugfix until XQuartz/XQuartz#216 is fixed, so probably just want to add some environment variable (e.g. PLANETMAPPER_USE_X11_FONT_BUGFIX) to enable this replacement, then add a note to docs about how to do it.

[ortk95]

Added temporary bugfix in #209 to v1.6.4 - this can be manually enabled with

export PLANETMAPPER_USE_X11_FONT_BUGFIX=true

For more details, see https://planetmapper.readthedocs.io/en/latest/common_issues.html#planetmapper-crashes-when-running-graphical-user-interface-over-ssh