240644 2022-05-19 05:55:27 -0700 Web Inspector: Computed Panel: Assertion Failed: Cannot remove view which isn't a subview. ComputedStyleSection 2022-05-19 14:50:52 -0700 1 1 1 Unclassified WebKit Web Inspector WebKit Nightly Build All All RESOLVED FIXED InRadar P2 Normal --- 1 rcaliman rcaliman inspector-bugzilla-changes webkit-bug-importer oldest_to_newest 1870342 0 rcaliman 2022-05-19 05:55:27 -0700 ``` [Error] Assertion Failed: Cannot remove view which isn't a subview. ComputedStyleSection {_listeners: Multimap, _element: <div class="computed-style-section">, _parentView: null, _subviews: [], _dirty: false, …} removeSubview (View.js:127) layout (ComputedStyleDetailsPanel.js:216) _layoutSubtree (View.js:308) _layoutSubtree (View.js:319) _layoutSubtree (View.js:319) _visitViewTreeForLayout (View.js:378) ``` The root cause of this failed assertion is an accumulation of orphaned `WI.ComputedStyleSection` instances in `this._detailsSectionByStyleSectionMap` from `WI.ComputedStyleDetailsPanel`. When `WI.ComputedStyleDetailsPanel.layout()` is called to reflect the latest selected node's variables, the previous `WI.ComputedStyleSection` view instance for ungrouped variables is accidentally kept around even though its host DOM node was removed. When attempting to remove this view on the next `layout()` run, this orphaned instance has no host node that belongs to the parent view so the assertion is hit. The issue gets progressively worse on each `layout()` run by accumulating more orphans. 1870343 1 webkit-bug-importer 2022-05-19 05:55:53 -0700 <rdar://problem/93571902> 1870379 2 rcaliman 2022-05-19 08:12:24 -0700 Pull request: https://github.com/WebKit/WebKit/pull/782 1870535 3 ews-feeder 2022-05-19 14:50:45 -0700 Committed r294506 (250763@main): <https://commits.webkit.org/250763@main> Reviewed commits have been landed. Closing PR #782 and removing active labels.