Get the maximum window content boundary in window-local coordinates.
Window content bottom-right: copied {x,y} in window-local pixels, accounting for scrolling.
Content boundaries max for the window (roughly (0,0)+Size-Scroll), in window-local coordinates.
You should never need this.
Always use GetCursorScreenPos() and GetContentRegionAvail()!
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Get the maximum window content boundary in window-local coordinates.