Formatter instability: Long string

[MichaReiser]

Input

mp3fmt="<span style=\"color: grey\"><a href=\"{}\" id=\"audiolink\">listen</a></span></br>\n"

Format 1

mp3fmt = '<span style="color: grey"><a href="{}" id="audiolink">listen</a></span></br>\n'

Format 2

mp3fmt = (
    '<span style="color: grey"><a href="{}" id="audiolink">listen</a></span></br>\n'
)

This could be due to the optimization where strings don't use the BestFit layout when they exceed a certain length (Format 1, but Format 2 uses best fit)

Sourced by #7445