Topic on Talk:Beta Features/PHP7

Realized that it's not the fault of PHP7 but the gadget itself.

1. Open Microsoft Internet Explorer 11, especially if you have either Microsoft Windows 7 or 8
2. The PHP7 Beta feature should be enabled.
3. Then go to "Gadget" tab in Preferences
4. Un-check the "Enable the editing toolbar" (2010 wikitext editor) to disable the toolbar
5. When the editor goes back to the default/2003, toolbar-less editor, checkmark the "Enable the legacy (2006) editing toolbar" option
6. Go to any page listed under w:en:Special:StablePages
7. Use the mouse scroll wheel, i.e. mouse scroller, to scroll down the if your mouse has one.

Expected result: The lines should not appear around the editor.

Actual result: The lines appear when scrolling down and then up (seen in the below picture). The lines then disappears when:

1. the mouse pointer moves out of the editor (with the Legacy toolbar enabled)
2. you press the "Enter" key within the editor
3. you press "Page Down"/"PgDown" and/or the "Page Up"/"PgUp" key
4. you use a mouse to highlight any text within the editor

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I wanted to take this to the Phabricator, but the gadget is not part of the Mediawiki software. I decided to describe the issue here instead.

I found out that it's the gadget itself, not the PHP7. I disabled the PHP7, and I found the same results.