[Description] Handles DisplayProperties::LogicalDpiChanged. The DPI for the main game window has changed, and the game app adjusts its resources accordingly. Note CoreWindow coordinates are in DIPs (Device Independent Pixels), as in Direct2D. As a result, you must notify Direct2D of the change in DPI to display any 2D assets or primitives correctly. [Event handler] 
OnLogicalDpiChanged
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O n L o g i c a l D p i C h a n g e d
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