GitLab

Other paths in avrdude.upload.pattern are wrapped in double quotes, and
this -P{serial.port} causes issues with some platforms. This allows
serial port devices which include spaces and other characters. Without
this fix a /dev/tty* or /dev/cu* device that includes a space in its
name gets truncated when passed to avrdude. Error messages returned
from avrdude are cryptic, and workarounds (symlinks) are prone to
failure.

Fixes #3693