assertSame() is guaranteed to never do any magic type conversion.
This can be critical when accidentially comparing empty strings (a
value PHP considers to be "falsy") to false, 0, 0.0, null, and such.
Change-Id: I2e2685c5992cae252f629a68ffe1a049f2e5ed1b
UnknownContentHandler can be configued to handle models that
belong to extensions that have been undeployed:
$wgContentHandlers['xyzzy'] = 'UnknownContentHandler';
This way, no errors will be thrown when trying to access
pages with the unsupported model. Instead, an error message is
shown, and editing is prevented.
This patch also improves handling of non-editable content in
EditPage and in DifferenceEngine.
Bug: T220608
Change-Id: Ia94521b786c0a5225a674e4dc3cb6761a723d75b
