Preview error on removing last row of table

[Andrew Parsloe]

Version 2.4.0-beta3-devel (Sunday, 11 December 2022)
Qt Version (run-time): 6.5.1 on platform windows

Put a small table inside a preview inset, move the cursor outside the 
inset and wait for the preview to form. Now delete the last row of the 
table by clicking the icon or Alt+M W D and move the cursor outside the 
preview inset. A new preview is not triggered. The old preview is used. 
It is possible to delete all except the first row in this way, and still 
have the preview display the initial full table. This happens only with 
the last row. Deleting other rows generates new previews.

(This is not a big issue but a little confusing when first met.)

Andrew