Allow selection promotion when editing wrong field type.

Also fixes a bug where a CHT_MODIFY on a parent symbol with a
selected child doesn't trigger a selection modified event.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/17696

(cherry picked from commit 1aa59b806c)

eeschema/sch_commit.cpp

@@ -209,7 +209,18 @@ void SCH_COMMIT::pushSchEdit( const wxString& aMessage, int aCommitFlags )
             schematic = schItem->Schematic();
 
         if( schItem->IsSelected() )
+        {
             selectedModified = true;
+        }
+        else
+        {
+            schItem->RunOnChildren(
+                    [&selectedModified]( SCH_ITEM* aChild )
+                    {
+                        if( aChild->IsSelected() )
+                            selectedModified = true;
+                    } );
+        }
 
         auto updateConnectivityFlag = [&, this]()
         {