[Lazarus] Maybe it's TreeView hi-dpi bug on Linux?

[Werner Pamler]

Am 02.08.2019 um 21:18 schrieb AlexeyT via lazarus:
> I cannot test hi-dpi on Linux.
Why not? Just set the DPI of your system to something higher than 96, 
maybe 120 or at most 144. Beyond 144dpi there will not be much left on 
the screen to work on...