Fix grid header/cell drift with collapsed first column group and explicit widths

[Copilot]

When the first column group is collapsed and its child columns have explicit widths, horizontal scrolling can desync standalone column headers from body cells. This change aligns group width resolution with runtime visible state and adds a regression that reproduces the exact scenario.

• Root cause addressed

  • IgxColumnGroupComponent could expose a width path that diverged from the current collapsed/visible child state during horizontal scroll.
  • Header/body layout consumers then used inconsistent effective widths.

• Implementation

  • IgxColumnGroupComponent.calcWidth now returns the group’s live computed width (derived from currently visible children), matching the width used by rendering paths.
  • This removes stale width behavior for collapsed-group + explicit-child-width combinations.

• Regression coverage

  • Added a dedicated grid sample host with:
    • first column group collapsed
    • explicit widths on grouped columns
    • horizontal overflow with standalone columns
  • Added integration spec asserting standalone header/body alignment remains synchronized after horizontal scroll.

// column-group.component.ts
public override get calcWidth(): any {
    return this.width;
}

• UI evidence
  • https://github.com/user-attachments/assets/d609d338-e4fc-466f-b1d7-0e16a138d922

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• accounts.google.com
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4744 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-25210987 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,2670706588722563648,976662850827444110,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4745 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-75124667 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,4831750644246996471,12547478170409417441,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --user-data-dir=/tmp/karma-25210987 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --window-size=820,800 --js-flags=--expose-gc http://localhost:9876/?id=25210987 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)
• android.clients.google.com
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4744 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-25210987 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,2670706588722563648,976662850827444110,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --user-data-dir=/tmp/karma-25210987 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --window-size=820,800 --js-flags=--expose-gc http://localhost:9876/?id=25210987 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=5055 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-26303113 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,6961450597459373940,16679879124788585741,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
• clients2.google.com
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4744 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-25210987 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,2670706588722563648,976662850827444110,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4745 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-75124667 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,4831750644246996471,12547478170409417441,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --user-data-dir=/tmp/karma-75124667 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --window-size=820,800 --js-flags=--expose-gc http://localhost:9876/?id=75124667 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)
• clientservices.googleapis.com
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4745 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-75124667 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,4831750644246996471,12547478170409417441,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4744 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-25210987 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,2670706588722563648,976662850827444110,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --user-data-dir=/tmp/karma-75124667 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --window-size=820,800 --js-flags=--expose-gc http://localhost:9876/?id=75124667 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)
• redirector.gvt1.com
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4744 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-25210987 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,2670706588722563648,976662850827444110,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4745 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-75124667 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,4831750644246996471,12547478170409417441,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --user-data-dir=/tmp/karma-75124667 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --window-size=820,800 --js-flags=--expose-gc http://localhost:9876/?id=75124667 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)
• safebrowsingohttpgateway.googleapis.com
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4745 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-75124667 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,4831750644246996471,12547478170409417441,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --user-data-dir=/tmp/karma-75124667 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --window-size=820,800 --js-flags=--expose-gc http://localhost:9876/?id=75124667 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4744 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-25210987 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,2670706588722563648,976662850827444110,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
• www.google.com
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4744 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-25210987 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,2670706588722563648,976662850827444110,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4745 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-75124667 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,4831750644246996471,12547478170409417441,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --user-data-dir=/tmp/karma-25210987 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --window-size=820,800 --js-flags=--expose-gc http://localhost:9876/?id=25210987 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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