[PATCH] lineedit: fix output formatting for tab completion

[Tomas Heinrich]

Hi,

there are two minor bugs in lineedit's tab completion output with regard 
to unicode chars:

- unicode chars with visual width != 1 cause the columnar output to misalign
   $ touch /tmp/a<U+2329>b
   $ ls /tmp/^I^I

- chars configured as unsupported don't get substituted in the output

The attached patch should fix this.

Tomas
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