Missing expression scope in batch processing expression builder (alternative)

[nyalldawson]

Alternate fix to #56132

[github-actions]

🪟 Windows builds ready!

Windows builds of this PR are available for testing here. Debug symbols for this build are available here.

(Built from commit a3d2fb4)

[alexbruy]

Looks good to me

[qgis-bot]

The backport to release-3_34 failed:

The process '/usr/bin/git' failed with exit code 1

stderr

error: could not apply 2ab9e350f8a... Cleanup code, only run checks when warnOnInvalid is True
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

stdout

Auto-merging python/plugins/processing/gui/BatchPanel.py
CONFLICT (content): Merge conflict in python/plugins/processing/gui/BatchPanel.py

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-release-3_34 release-3_34
# Navigate to the new working tree
cd .worktrees/backport-release-3_34
# Create a new branch
git switch --create backport-56411-to-release-3_34
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 2ab9e350f8af615502c41165fe13308200652410,60b363518cfee3cd3ec9acf7a8a4d33de4ad4253,af4da9dcff6ae6b83f8cce7e78a7345096946162,a3d2fb409d7b086f7b504815a67a8f4ab3e9ae8a
# Push it to GitHub
git push --set-upstream origin backport-56411-to-release-3_34
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-release-3_34

Then, create a pull request where the base branch is release-3_34 and the compare/head branch is backport-56411-to-release-3_34.