[release-4.22] OCPBUGS-100317: Fix pod terminal not rendering until resize

[Leo6Leo]

Summary

Backport of #16498 to release-4.22.

• Bug: https://issues.redhat.com/browse/OCPBUGS-100317
• Replace setTimeout(0) + fitAddon.fit() with a ResizeObserver (via PatternFly's getResizeObserver) to fix the race condition between xterm fitting and React 18's batched state updates
• The terminal container starts with 0x0 dimensions; fit() was firing before the DOM had correct dimensions, leaving xterm unable to render until a manual window resize

Test plan

• Navigate to Workloads → Pods → select a running pod → Terminal tab
• Verify the shell prompt appears immediately without needing to resize the browser window
• Resize the browser window — terminal should re-fit correctly
• Click Expand (fullscreen) — terminal should fill the viewport
• Click Collapse — terminal should return to normal size
• Switch containers (if pod has multiple) — new terminal should render promptly

🤖 Generated with Claude Code

[openshift-merge-bot]

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This repository is configured in: LGTM mode

[openshift-ci-robot]

@Leo6Leo: This pull request references Jira Issue OCPBUGS-100317, which is invalid:

• release note text must be set and not match the template OR release note type must be set to "Release Note Not Required". For more information you can reference the OpenShift Bug Process.

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

Details

In response to this:

Summary

Backport of #16498 to release-4.22.

• Bug: https://issues.redhat.com/browse/OCPBUGS-100317
• Replace setTimeout(0) + fitAddon.fit() with a ResizeObserver (via PatternFly's getResizeObserver) to fix the race condition between xterm fitting and React 18's batched state updates
• The terminal container starts with 0x0 dimensions; fit() was firing before the DOM had correct dimensions, leaving xterm unable to render until a manual window resize

Test plan

• Navigate to Workloads → Pods → select a running pod → Terminal tab
• Verify the shell prompt appears immediately without needing to resize the browser window
• Resize the browser window — terminal should re-fit correctly
• Click Expand (fullscreen) — terminal should fill the viewport
• Click Collapse — terminal should return to normal size
• Switch containers (if pod has multiple) — new terminal should render promptly

🤖 Generated with Claude Code

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[Leo6Leo]

/jira refresh

[openshift-ci-robot]

@Leo6Leo: This pull request references Jira Issue OCPBUGS-100317, which is valid. The bug has been moved to the POST state.

7 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.22.0) matches configured target version for branch (4.22.0)
• bug is in the state New, which is one of the valid states (NEW, ASSIGNED, POST)
• release note text is set and does not match the template
• dependent bug Jira Issue OCPBUGS-84649 is in the state MODIFIED, which is one of the valid states (MODIFIED, ON_QA, VERIFIED)
• dependent Jira Issue OCPBUGS-84649 targets the "5.0.0" version, which is one of the valid target versions: 5.0.0
• bug has dependents

The bug has been updated to refer to the pull request using the external bug tracker.

Details

In response to this:

/jira refresh

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[logonoff]

/lgtm

[openshift-merge-bot]

Scheduling tests matching the pipeline_run_if_changed or not excluded by pipeline_skip_if_only_changed parameters:
/test e2e-gcp-console

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Leo6Leo, logonoff

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[logonoff]

/label backport-risk-assessed

Pls self verify

[Leo6Leo]

/verified by @Leo6Leo

[openshift-ci-robot]

@Leo6Leo: This PR has been marked as verified by @Leo6Leo.

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/verified by @Leo6Leo

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[openshift-ci]

@Leo6Leo: all tests passed!

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[openshift-ci-robot]

@Leo6Leo: Jira Issue Verification Checks: Jira Issue OCPBUGS-100317
✔️ This pull request was pre-merge verified.
✔️ All associated pull requests have merged.
✔️ All associated, merged pull requests were pre-merge verified.

Jira Issue OCPBUGS-100317 has been moved to the MODIFIED state and will move to the VERIFIED state when the change is available in an accepted nightly payload. 🕓

Details

In response to this:

Summary

Backport of #16498 to release-4.22.

• Bug: https://issues.redhat.com/browse/OCPBUGS-100317
• Replace setTimeout(0) + fitAddon.fit() with a ResizeObserver (via PatternFly's getResizeObserver) to fix the race condition between xterm fitting and React 18's batched state updates
• The terminal container starts with 0x0 dimensions; fit() was firing before the DOM had correct dimensions, leaving xterm unable to render until a manual window resize

Test plan

• Navigate to Workloads → Pods → select a running pod → Terminal tab
• Verify the shell prompt appears immediately without needing to resize the browser window
• Resize the browser window — terminal should re-fit correctly
• Click Expand (fullscreen) — terminal should fill the viewport
• Click Collapse — terminal should return to normal size
• Switch containers (if pod has multiple) — new terminal should render promptly

🤖 Generated with Claude Code

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[Leo6Leo]

/cherry-pick release-4.21

[openshift-cherrypick-robot]

@Leo6Leo: new pull request created: #16893

Details

In response to this:

/cherry-pick release-4.20

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[openshift-cherrypick-robot]

@Leo6Leo: new pull request created: #16894

Details

In response to this:

/cherry-pick release-4.21

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[openshift-merge-robot]

Fix included in release 4.22.0-0.nightly-2026-07-31-081336