Use NUL character as separator

Author: aibaars

.github/workflows/qhelp-pr-preview.yml

@@ -31,15 +31,15 @@ jobs:
       - name: Determine changed files
         id: changes
         run: |
-          (git diff --name-only --diff-filter=ACMRT HEAD~1 HEAD | grep '.qhelp$' | grep -v '.inc.qhelp';
-           git diff --name-only --diff-filter=ACMRT HEAD~1 HEAD | grep '.inc.qhelp$' | xargs -d '\n' -rn1 basename | xargs -d '\n' -rn1 git grep -l) |
-           grep '.qhelp$' | grep -v '^-' | sort -u > "${{ runner.temp }}/paths.txt"
+          (git diff -z --name-only --diff-filter=ACMRT HEAD~1 HEAD | grep -z '.qhelp$' | grep -z -v '.inc.qhelp';
+           git diff -z --name-only --diff-filter=ACMRT HEAD~1 HEAD | grep -z '.inc.qhelp$' | xargs --null -rn1 basename | xargs --null -rn1 git grep -z -l) |
+           grep -z '.qhelp$' | grep -z -v '^-' | sort -z -u > "${{ runner.temp }}/paths.txt"
 
       - name: QHelp preview
         run: |
           EXIT_CODE=0
           echo "QHelp previews:" > comment.txt
-          while read path; do
+          while read -r -d $'\0' path; do
             if [ ! -f "${path}" ]; then
                exit 1
             fi