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text: make unindenting remove from the beginning of the line
David Lawrence Ramsey authored
Also, only unindent when all selected lines can be unindented,
which means that the relative indentation will be preserved.
For this purpose, it ignores empty lines and lines consisting
of only whitespace.

When unindenting is not possible, a message is shown.

This fixes https://savannah.gnu.org/bugs/?47684.
0f4716e1
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