In SQL Server would misc pages be pushed out when an object grows within a mixed extent?

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In SQL Server 2008-2012, objects (including tables) are first put in a mixed extent. An extent can accommodate up to 8 pages and accommodates more than one type of page (meaning: pages from more than one object). Say ExtentA has pages from objects A(2), B(2) and C(4) - numbers in parentheses indicate how many pages they own within that extent. Object B grows, and my question is: Would SQL Server start kicking out A and C's pages before assigning B a new, uniform extent (assuming it eventually outgrows extentA) OR it just jumps to a new extent given extentA is already full.

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