[konsole] [Bug 349088] Down arrow (and other arrows) characters display wrong width

[Norman Diamond]

https://bugs.kde.org/show_bug.cgi?id=349088

--- Comment #8 from Norman Diamond <n0diamond at yahoo.co.jp> ---
"The down arrow U+2193 is indeed of "ambiguous width" both in Unicode 8.0 and
9.0."

Then it's not entirely Konsole's fault, but we still need a workaround for the
Unicode consortium's bug.  The present behaviour sometimes makes Konsole
unusable, just like (retired C language lawyer speaks up now) a C compiler that
only compiled one single valid C program would be legal but unusable.

How did the Unicode consortium figure out that half-width a, full-width ａ,
lower-case a, upper-case A, upper-case Ａ, etc., shouldn't all have ambiguous
width, ambiguous casing, etc.  But just allowing Konsole to be unfriendly
doesn't force Konsole to be unfriendly.

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