Globs like "**/*.kt" should also match files in current directory

[paul-dingemans]

Description

The "**/*.kt" glob did not match files with extension ".kt" in the current dir, but only in sub directories due to the way how a glob was always converted to an absolute path.

Given a workdir contain a file that results in some lint violations:

~/workdir/src/main/kotlin $ ls      
Foo.kt

Get the lint violations without explicit patterns:

~/workdir/src/main/kotlin $ ktlint-0.45.2 *.kt --relative
Foo.kt:1:1: Unnecessary import (no-unused-imports)
Foo.kt:2:1: Missing space after // (comment-spacing)

Get the lint violations with explicit pattern *.kt:

~/workdir/src/main/kotlin $ ktlint-0.45.2 *.kt --relative
Foo.kt:1:1: Unnecessary import (no-unused-imports)
Foo.kt:2:1: Missing space after // (comment-spacing)

Get the lint violations with explicit pattern **/*.kt:

~/workdir/src/main/kotlin $ ktlint-0.45.2 **/*.kt --relative
<NO OUTPUT>

Get the lint violations with explicit pattern **/*.kt from the parent directory:

~/workdir/src/main/kotlin $ cd ..
~/workdir/src/main $ ktlint-0.45.2 **/*.kt --relative
kotlin/Foo.kt:1:1: Unnecessary import (no-unused-imports)
kotlin/Foo.kt:2:1: Missing space after // (comment-spacing)

Checklist

• PR description added
• tests are added
• CHANGELOG.md is updated

In case of adding a new rule:

• README.md is updated
• Rule has been applied on Ktlint itself and violations are fixed