We’ve just deployed some improvements to our keyboard shortcuts.
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On non-macOS platforms, the commands for moving a cell are now Control-Shift-Up and Control-Shift-Down. On mac, they are still Option-Command-Up ⌥⌘↑ and Option-Command-Down ⌥⌘↓, respectively.
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On macOS, we disabled several non-standard commands that were in CodeMirror’s defaults. Option-B ⌥B, Option-F ⌥F, Option-D ⌥D now insert a ∫, ƒ and ∂, respectively. Also disabled: Command-D ⌘D (used by some browsers to create a bookmark), Command-U ⌘U, and Shift-Command-U ⇧⌘U.