fix: Pressing Enter on block without inline content (#1010)

* Made selecting blocks without inline content also focus them when possible

* Changed hitting Enter in block without inline content to only create new block below if no modifier keys are held

* Revert "Made selecting blocks without inline content also focus them when possible"

This reverts commit aa992a6.

Author: matthewlipski

packages/core/src/extensions/NonEditableBlocks/NonEditableBlockPlugin.ts

@@ -33,7 +33,13 @@ export const NonEditableBlockPlugin = () => {
             return true;
           }
           // Checks if key press is Enter
-          if (event.key === "Enter") {
+          if (
+            event.key === "Enter" &&
+            !event.shiftKey &&
+            !event.altKey &&
+            !event.ctrlKey &&
+            !event.metaKey
+          ) {
             const tr = view.state.tr;
             view.dispatch(
               tr