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IE11: browser crashes on pressing Enter to switch to edit mode #21276

Description

Describe the bug

On IE11, with a block selected and with the editor in select mode, pressing Enter to switch to edit mode causes the editor to crash with the following error message:

TypeError: Unable to get property 'closest' of undefined or null reference
   at vi (http://isabel:8888/wp-content/plugins/gutenberg/build/block-editor/index.js?ver=4af3ae3fe13f697ebe49daa5a278cc59:49:122078)
   at Anonymous function (http://isabel:8888/wp-content/plugins/gutenberg/build/block-editor/index.js?ver=4af3ae3fe13f697ebe49daa5a278cc59:49:142265)
   at Anonymous function (http://isabel:8888/wp-content/plugins/gutenberg/build/block-editor/index.js?ver=4af3ae3fe13f697ebe49daa5a278cc59:49:142254)
   at commitHookEffectList (http://isabel:8888/wp-includes/js/dist/vendor/react-dom.js?ver=16.9.0:20124:9)
   at commitPassiveHookEffects (http://isabel:8888/wp-includes/js/dist/vendor/react-dom.js?ver=16.9.0:20154:11)
   at callCallback (http://isabel:8888/wp-includes/js/dist/vendor/react-dom.js?ver=16.9.0:341:9)

The console also reports:

The above error occurred in the <ForwardRef> component:
    in ForwardRef (created by ForwardRef)
    in ForwardRef
    in Unknown (created by t)
    in t (created by WithInstanceId(t))
    in WithInstanceId(t) (created by WithSpokenMessages(WithInstanceId(t)))
    in WithSpokenMessages(WithInstanceId(t))
    in Unknown (created by Context.Consumer)
    in WithBlockEditContext(Component) (created by t)
    in t
    in Unknown (created by WithSafeTimeout(Component))
    in WithSafeTimeout(Component) (created by ForwardRef)
    in ForwardRef (created by ForwardRef(e))
    in ForwardRef(e)
    in Unknown
    in Unknown (created by WithToolbarControls(Component))
    in WithToolbarControls(Component) (created by WithInspectorControl(WithToolbarControls(Component)))
    in WithInspectorControl(WithToolbarControls(Component)) (created by WithInspectorControl(WithInspectorControl(WithToolbarControls(Component))))
    in WithInspectorControl(WithInspectorControl(WithToolbarControls(Component))) (created by WithToolba

To reproduce
Steps to reproduce the behavior:

  1. On IE11, navigate to a post in the editor.
  2. With a block selected, press Esc to switch select mode, then press Enter to switch back to edit mode
  3. See error

Expected behavior

Expected all keyboard shortcuts to work correctly.

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Browser IssuesIssues or PRs that are related to browser specific problems[Priority] HighUsed to indicate top priority items that need quick attention[Status] In ProgressTracking issues with work in progress[Type] BugAn existing feature does not function as intended

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