Handle make targets with `/` correctly

[ncfavier]

Describe the bug

When completing make foo/<Tab>, a target named foo/bar gets listed as just bar, and completing it removes the foo/ prefix.

Also, completing foo<Tab> inserts a slash and a space. It should not insert a space, just like filename completion works.

To reproduce

1. git clone --depth=1 https://github.com/NixOS/nix
2. cd nix
3. make tests/<Tab>

Versions (please complete the following information)

• Operating system name/distribution and version: NixOS unstable
• bash version, echo "$BASH_VERSION": 5.1.16(1)-release
• bash-completion version, (IFS=.; echo "${BASH_COMPLETION_VERSINFO[*]}"): 2.11

[akinomyoga]

Thanks for the report! I believe this is a duplicate of #544. A fix is proposed at #546 but is blocked by an issue related to the test framework. Maybe I should take a look at it again and decide to revert the feature introduced in commit 39f00f9 that attempts to show the completion list in a compact form.

[ncfavier]

Thanks, feel free to close.

[akinomyoga]

Thank you for your reply! If you have further comments later, you can post them in #544. Thank you!