[ui] Restrain the "copy/paste nodes" shortcuts to the GraphEditor #1782
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Description
This PR fixes an issue introduced with #1758 which overrides any Ctrl+C / Ctrl+V shortcut with a "Copy node(s)" / "Paste node(s)", no matter which part of Meshroom has the focus or which element is currently selected.
If a Ctrl+C or Ctrl+V shortcut is performed outside the GraphEditor, the performed action should not be a copy or a paste of the nodes, but the own copy/paste of the current element. For example, if the currently selected element is a text field in the NodeEditor, then using Ctrl+C shoud trigger that text field's own copy function and copy its content to the clipboard; "Copy node(s)" and "Paste node(s)" should only be called when Ctrl+C and Ctrl+V are performed within the GraphEditor.