This screenshot is taken off of LMDE4 Cinnamon, 64 bit, gtk2, MintY Dark. --> correct display, nothing cut off.
I would not say that the incorrect text height determination is a Lazarus bug. Lazarus cannot fix the inconsistencies of the widgetsets and their dependence on dozens of themes.
The problem with Linux compared to Windows is that it is so heterogeneous (I do agree that there are also problems of the Windows side -- so please, don't start a flame war here).