When RealtimePreview is open, and the VisualEditor mode-switch menu is opened, when the cursor is moved over the RTP pane the 'Reload' button is on top of the mode-switch menu:
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Event Timeline
There's a rule in CodeMirror (written by myself 5 years ago) that gives the toolbar a z-index of 7, so this is only broken when CodeMirror is not installed.
We should probably upstream that rule to WikiEditor.
Change 1011016 had a related patch set uploaded (by Samwilson; author: Samwilson):
[mediawiki/extensions/WikiEditor@master] Set toolbar z-index to 7, to be above other UI elements
Change 1011153 had a related patch set uploaded (by Esanders; author: Esanders):
[mediawiki/extensions/CodeMirror@master] Remove WikiEditor toolbar z-index override
Change 1011016 merged by jenkins-bot:
[mediawiki/extensions/WikiEditor@master] Set toolbar z-index to 7, to be above other UI elements
Change 1011153 merged by jenkins-bot:
[mediawiki/extensions/CodeMirror@master] Remove WikiEditor toolbar z-index override