Track Changes: Context menu not showed anymore in angular UI for structural / pseudo elements + Click on document view scrollbars

Track changes context menu with accept and reject options is not showed anymore in angular UI version for structural / pseudo elements.

After checking it this issue appeared after merging: https://code.europa.eu/leos/core/-/merge_requests/1328

This is due these changes:

• User can do zoom in the document view and this affects the element position calculation.
• A new "main-container" div has been introduced and now scrollbars are not in "docContainer" div like before.

Note: In Vaadin version there´s no problem, user cannot do zoom and scrollbars continue in the "docContainer" div.

Another functionality broken with the ZOOM implementation is that when CKEditor is open and implicit save and close enabled user can click on scrollbars and CKEditor has to be mantained opened and not to close. With the ZOOM implementation position over scrollbars are not calculated correctly and then CKEditor is closed.