[Bug 1890644] [NEW] bash-completion for make target with colon fails

[Christian Hujer]

Public bug reported:

Given the following Makefile

```
foo\:bar:
	echo foo >$@
```

When completing
Expected: Then completion completes to "foo:bar"
Actual: Then completion completes to "foo"

Change needed: The completion needs to ignore a colon in the target name
when the colon is prefixed with a backslash.

** Affects: bash-completion (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1890644

Title:
  bash-completion for make target with colon fails

Status in bash-completion package in Ubuntu:
  New

Bug description:
  Given the following Makefile

  ```
  foo\:bar:
  	echo foo >$@
  ```

  When completing
  Expected: Then completion completes to "foo:bar"
  Actual: Then completion completes to "foo"

  Change needed: The completion needs to ignore a colon in the target
  name when the colon is prefixed with a backslash.

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