REQUEST: Panels' scroll bars

[KirilStrezikozin]

This feature request is:

• not a duplicate
• implemented

Is your feature request related to a problem? Please describe.
thomas | Spaceflower#2247 (Discord):
make this a scroll box if possible. Would help with that many objects

Describe the solution you'd like to be implemented
Some UILists have a fixed rows value equal to the number of items in it. Need to add a scroll bar if that number is too big.

[KirilStrezikozin]

I'll need to make sure there's a scroll bar for each UIList.

---

rows equals to min template_list's row height.
rows = len(CollectionProperty_Instance) means there won't be any scroll bar.

so I did dynamic rows value for bm_table_of_objects template_list to allow scrollbar when there're too many objects:

BakeMaster-Blender-Addon/ui_panel_base.py

Line 518 in 041cb0a

row.template_list('BM_UL_Table_of_Objects_Item', "", scene, 'bm_table_of_objects', scene.bm_props, 'global_active_index', rows=rows)

rows value there depends on ui buttons displayed, so that'll be too much for other simple tables where min rows could be smth like 5:

rows = 5
self.layout.template_list(..., rows=rows)