Completely support full-width characters in differential rendering #629
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(Original pull request: #519)
When dialog is cleared, we need to restore the text that was hidden behind dialogs.
To implement restoring full width characters hidden behind dialog,
Reline::Unicode.take_rangelacks of feature.It does not provide where to render the string. column information is missing.
Sometimes we need other cut variation depending on adjacent dialog position.

The image below shows a variation of
take_range('一二三四五六七八九', 5, 8, option)So I add
Reline::Unicode.take_mbchar_rangethat has optioncover_begin, cover_end, paddingand make it return the actual cut position.