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Abstract:Package managers are legion. Every programming language and operating system has its own solution, each with subtly different semantics for dependency resolution. This fragmentation prevents multilingual projects from expressing precise dependencies across language ecosystems; it leaves external system and hardware dependencies implicit and unversioned; it obscures security vulnerabilities that lie in the full dependency graph. We present the \textit{Package Calculus}, a formalism for dependency resolution that unifies the core semantics of diverse package managers. Through a series of formal reductions, we show how this core is expressive enough to model the diversity that real-world package managers employ in their dependency expression languages. By using the Package Calculus as the intermediate representation of dependencies, we enable translation between distinct package managers and resolution across ecosystems.
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We fixed in issue where the window switcher could leave a non-interactive area on screen when closed, plus an issue where the 6th and 13th keypresses could be skipped while Alt + Tabing. We fixed a couple of issues with multitasking, including ones with fullscreen windows not properly being moved, animations when reordering workspaces, and missing icons in the show all windows view. Plus we fixed blurry picture-in-picture resize icons on fractionally scaled displays.