Description:
If i have a spreadsheet with more than 17 columns, I can't use Data Entry Form to fill datas beacause I can't access fields 18 and after.

Scrolldown is used by "Go to Next Entry", and when I use Tab, next fields are selected and I can modify them but display does not refresh so I could see them actually on screen.

My H-resolution is 1366 px.

Steps to Reproduce:
1. On debian 9 with gnome 3.22.3 install libreoffice libreoffice-gnome libreoffice-gtk3 from Debian Stable rep or from Flathub (6.2.2)
2. Set height screen resolution at 1366 or less
2. Create a spreadsheet with 20 columns or more 
3. Go to Data > Form and try to edit last fields

Actual Results:
you can't see fields 18-20, but you can access and edit them with TAB

Expected Results:
we would have a way to scroll down to see last fields. A second scroll bar ? just refresh display when using tab ?


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
Version: 6.2.2.2
Build ID: 2b840030fec2aae0fd2658d8d4f9548af4e3518d
Threads CPU : 4; OS : Linux 4.9; UI Render : par défaut; VCL: gtk3; 
Flatpak
Locale : fr-FR (fr_FR.utf8); Langue IHM : fr-FR
Calc: threaded

Also tried with SAL_USE_VCLPLUGIN=gen soffice