[RFC] Workaround for broken message index row heights

[Albrecht Dreß <albrecht dress arcor de>]

Hi all,

I /think/ I finally found a workaround for the sometimes broken display of the row heights in the balsa 
message index, apparently caused by GtkTreeView's automatic calculation being confused by rows being printed 
in bold and/or italics.

For testing, I created the branch “index_row_height_workaround” in which the cell renderer heights are forced 
to the maximum of 1.25 times the standard font height and the status icon heights.  Drawback: if the standard 
font is changed in the global settings, the required row height is re-calculated only after a restart of 
Balsa, which IMHO is acceptable.

For me, this *completely* fixes the issue, but some more testing with different themes and Gtk versions would 
be really helpful.

Best,
Albrecht.

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