Admin: Add Ctrl/Cmd+Enter keyboard shortcut to submit comment forms.

Allow submitting the comment reply/edit form in wp-admin with Ctrl+Enter (Windows/Linux) or Cmd+Enter (Mac), matching the existing frontend comment form behavior added in ticket #41545. The handler is added to the existing keydown event on the comment textarea, preventing listener stacking and respecting IME composition state.

Implements Trac #48536.

Author: vidushigupta0607

src/js/_enqueues/admin/edit-comments.js

@@ -1046,6 +1046,12 @@ window.commentReply = {
 					if ( e.type === 'keydown' && e.which === 27 && isContextMenuOpen ) {
 						isContextMenuOpen = false;
 					}
+
+					// Submit the comment when Ctrl+Enter (Windows/Linux) or Cmd+Enter (Mac) is pressed.
+					if ( e.type === 'keydown' && ( e.ctrlKey || e.metaKey ) && e.which === 13 && ! isComposing ) {
+						e.preventDefault();
+						commentReply.send();
+					}
 				} )
 				.on( 'keyup', function( e ) {
 					// Close on Escape unless Input Method Editors (IMEs) are in use or the context menu is open.