Changelog: 1598 fragment

changelog.d/1598-shortcuts-modifier-keys.md

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+- Keep single-key app shortcuts off Cmd, Ctrl and Alt combinations, so Cmd+F,
+  Cmd+C and Cmd+R reach the browser instead of hiding the layer panel or
+  switching layers on. `F` now collapses the layer panel the way its button
+  does, instead of hiding the panel and the button that brings it back
+  (asturksever, #1598).