fixed inline fragment renderer
merged branch jfsimon/issue-8450 (PR #8462)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #8462).

Discussion
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[HttpKernel] fixed inline fragment renderer

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8450
| License       | MIT
| Doc PR        | none

Commits
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1554f1f [HttpKernel] fixed inline fragment renderer