Lintian tag information: whitespace-after-continuation-character (type: error)

Description (from lintian-explain-tags)

The menu item is split up over two or more continuation lines, but there
is additional whitespace after the backslash (\) that indicates where
lines should be joined together.

There is no guarantee that such additional whitespace is handled
correctly. The backslash should be the end of the line.

Visibility: error
Show-Always: no
Check: menu-format

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