Use `when` clause in keybinding overrides

I would love to use something like this:

"vim.insertModeKeyBindings": [
       {
           "before": ["ctrl", "p"],
           "after": [],
           "commands": [
               {
                   "command": "editor.action.triggerSuggest",
                   "when": "editorHasCompletionItemProvider && editorTextFocus && !editorReadonly && !suggestWidgetVisible"
               },
               {
                   "command": "selectPrevSuggestion",
                   "when": "editorTextFocus && suggestWidgetVisible"
               }
           ]
       },
       {
           "before": ["ctrl", "n"],
           "after": [],
           "commands": [
               {
                   "command": "editor.action.triggerSuggest",
                   "when": "editorHasCompletionItemProvider && editorTextFocus && !editorReadonly && !suggestWidgetVisible"
               },
               {
                   "command": "selectNextSuggestion",
                   "when": "editorTextFocus && suggestWidgetVisible"
               }
           ]
       }
  ]

Use-case

Demonstrates behavior of Ctrl + P in normal and insert modes.

Normal mode

Works without change - lets me find and open a file in a project.

Insert mode

When I do not have suggestion window visible, it will trigger the suggestion window to be visible.

When I do have suggestion window visible, it will go to previous suggestion.

No files, tests, or entry points are named. Start by locating the keybinding override configuration and its command-dispatch handling, then determine how existing keybindings are evaluated. Done means command entries can include when clauses so the appropriate command runs depending on editor and suggestion-widget context.