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Created attachment 1164 [details]
Patch to fix bug
When TextBoxes have larger nonclient areas, the bottom of the text gets cut-off due to the textbox setting its Height to the PreferredHeight [in some areas], which is calculated from the font - it should be the client height.
This also causes unnecessary height updates because update-checks always find a mismatch with client height but update the non-client height.
I've found all uses of TextBoxBase.PreferredHeight and treated PreferredHeight as non-client height (as seen in .NET behavior). The patch is attached.
PreferredHeight contains some magic numbers that were compensating statically for this miscalculation; Windows Forms textboxes may end up slightly taller or shorter than before.
This bug was found in Mono 2.10.2.