[Bug 1911676] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for apt has completed
successfully and the package is now being released to -updates.
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https://bugs.launchpad.net/bugs/1911676

Title:
  Short pattern not terminated by  ~ or !

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Focal:
  Fix Committed
Status in apt source package in Groovy:
  Fix Released

Bug description:
  [Impact]

  Short patterns like ~nfoo!~nbar or ~nfoo~nbar do not work correctly -
  they are treated as ?name(foo!~nbar) / ?name(foo~nbar) rather than
  ?name(foo)?not(?name(bar)) / ?name(foo)?name(bar)

  [Test Case]
  Unit tests have been added that are run during build and check they are parsed correctly

  +   EXPECT_PATTERN_EQ("~napt~nfoo", "?and(?name(apt),?name(foo))");
  +   EXPECT_PATTERN_EQ("~napt!~nfoo", "?and(?name(apt),?not(?name(foo)))");

  [Where problems could occur]
  Really just changing a string constant for this change in a function that parses of words, so well, the only problem arising could be that words inside patterns are recognized wrongly.

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