Issue with -g "!dirname/" when the CWD is "dirname"

[twmr]

What version of ripgrep are you using?

ripgrep 12.1.1 (rev 7cb211378a)
-SIMD -AVX (compiled)
+SIMD +AVX (runtime)

How did you install ripgrep?

sudo dpkg -i ripgrep_12*.deb

What operating system are you using ripgrep on?

Ubuntu 19.10

Describe your bug.

If a glob pattern and a root directory is passed to rg, the ignored files depend on the current working directory.

Why do I care?

I'm using an emacs pkg called dumb-jump, that executes rg in the directory of the currently visited file and not in the project root. The project root is always passed as the last parameter to rg. dumb-jump allows to pass additional parameter to ripgrep, which I need because I need to ignore large directories that make ripgrep slow.

What are the steps to reproduce the behavior?

#!/bin/bash
set -x

rm -rf /tmp/foo

mkdir -p /tmp/foo/to-be-ignored
mkdir /tmp/foo/dir1

touch /tmp/foo/to-be-ignored/a
touch /tmp/foo/dir1/d

#### setup done ####

cd /tmp/foo/to-be-ignored
# no output expected:  BUG
rg --files -g '!to-be-ignored/' /tmp/foo | grep to-be-ignored

cd /tmp/foo/dir1
# no output expected:  OK
rg --files -g '!to-be-ignored/' /tmp/foo | grep to-be-ignored

cd /tmp/foo
# no output expected:  OK
rg --files -g '!to-be-ignored/' /tmp/foo | grep to-be-ignored


cd /tmp/foo/to-be-ignored
# no output expected:  OK
rg --files -g '!dir1/' /tmp/foo | grep dir1

cd /tmp/foo/dir1
# no output expected:  BUG
rg --files -g '!dir1/' /tmp/foo | grep dir1

cd /tmp/foo
# no output expected:  OK
rg --files -g '!dir1/' /tmp/foo | grep dir1

What is the actual behavior?

+ mkdir -p /tmp/foo/to-be-ignored
+ mkdir /tmp/foo/dir1
+ touch /tmp/foo/to-be-ignored/a
+ touch /tmp/foo/dir1/d
+ cd /tmp/foo/to-be-ignored
+ rg --files -g '!to-be-ignored/' /tmp/foo
+ grep to-be-ignored
/tmp/foo/to-be-ignored/a
+ cd /tmp/foo/dir1
+ rg --files -g '!to-be-ignored/' /tmp/foo
+ grep to-be-ignored
+ cd /tmp/foo
+ rg --files -g '!to-be-ignored/' /tmp/foo
+ grep to-be-ignored
+ cd /tmp/foo/to-be-ignored
+ grep dir1
+ rg --files -g '!dir1/' /tmp/foo
+ cd /tmp/foo/dir1
+ grep dir1
+ rg --files -g '!dir1/' /tmp/foo
/tmp/foo/dir1/d
+ cd /tmp/foo
+ rg --files -g '!dir1/' /tmp/foo
+ grep dir1

If the current-working directory is the same as the ignored directory passed to -g, then the glob pattern doesn't work.

What is the expected behavior?

In all the rg calls in the above bash script, I don't expect any output.