Table Cell Properties Balloon Positioned Outside Viewport on Long Content Pages #370
Description
Issue Summary:
When using the Table Cell Properties feature in CKEditor 5, the contextual balloon (popup) sometimes renders outside the visible viewport, especially when:
A large amount of content exists in the editor.
A table is inserted near the bottom of the visible area.
A user opens Table Cell Properties from the toolbar or right-click menu.
This results in the user not seeing or being able to interact with the popup, which breaks usability.
Steps to Reproduce:
Open a CKEditor instance (using the Table plugin).
Add several lines of content to push the table near the bottom of the editor viewport.
Insert a table and select a table cell.
Open the Cell Properties option via the balloon toolbar.
Observe that the popup renders outside the visible screen or overlaps oddly.
