Thanks, ->update fixes it.
I now have a simple script that automatically sets the correct height on rows based on the pixel values from dlineinfo. However, it only works on the cells that are in the screen; it fails on the cells that are off the bottom.
I could cycle through all the cells, putting the contents of each one into cell 0,0 (first row), storing the required height for each one. Then I could draw the final table with those values. But I would probably get a lot of flickering as the cell is refreshed. I can't just move the $mw off the screen because it's visible already when this process starts. Maybe I could try creating a new toplevel and withdrawing it right away... but of course that only works if dlineinfo returns values from a withdrawn window. Perhaps create a new toplevel, move it off the screen and try to hide the icon in the taskbar somehow? Perhaps use a Dialog instead of a toplevel window so I don't get a taskbar icon?
I'll be trying these things but I'd be grateful for tips in case they don't work or there is a better option.

In reply to Re^5: Query the height of Tk::Text widget with word wrap by elef
in thread Query the height of Tk::Text widget with word wrap by elef

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