Apps page up/down scrolling cuts of data

[nitram]

Hi everyone, miss me

Scrolling up/down left-side extension list (*.tcz) and right-side window tabs (eg. Depends tab) cuts off data,
when using either page up/down key or mouse click on scroll bar (move up/down one 'page' at a time).

Tedious work-around: manually scroll back up/down 1-2 lines to check for missed items,
or grab and carefully slide scroll bar up/down.

Noticed in both Xvesa and Xorg on different systems with different screen resolutions,
using default Apps window size.

Extension list example: Apps empty search, last fully readable item at the bottom is alsamixergui.tcz, single-click scroll bar to go down one page,
first full readable top item is alsa-modules-3.16.6-tinycore.tcz, which means alsa-modules-3.16.6-tinycore64.tcz got missed.

Could give similar examples of right-side Files and Depends tabs if needed.

How hard to change so that a scroll up/down maybe moves one screen minus 2 lines or something similar?

[curaga]

Probably a fltk bug, but I can't reproduce in the fltk browser sample.