I think exploring the selection highlight metrics is an exercise in futility.

Better to explore what is controlling the line spacing, paragraph spacing, table cell margins and table row height parameters, each of which could be a factor in what you are seeing. Table rows will normally grow in height to fit the text inside them but you can override that by setting a specific row height. If the line spacing is smaller than the font size then I would expect text to be cut off at the bottom.

If you want to post a sample doc, we can tell you exactly why your text is being cut off.

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Andrew Lockton
Chrysalis Design, Melbourne Australia