Plugin              start (x/y px)  grid (x/y px)
-----------------------------------------------------
planner             0016 x 0008     no fixed grid
calendar            0016 x 0368     24 x 24
sticky_notes        0016 x 0528     24 x 24
compose_in_taskbar  0016 x 0720     24 x 24
jappix4roundcube    0016 x 0816     24 x 24
carddav             0016 x 0912     
taskbar             0016 x 0976
settings            0016 x 1040     24 x 24
markbuttons         0016 x 1136     16 x 16
scheduled_sending   0016 x 1256     
hmail_rules         0016 x 1360     24 x 24
hmail_signature     0016 x 1424     24 x 24
rss_feed            0016 x 1488     16 x 16
vcard_attachments   0016 x 1552     
vcard_send          0016 x 1648
vkeyboard           0016 x 1720
webmail_notifier    0016 x 1784
keyboard_shortcuts  0016 x 1848
contextmenu         0016 x 2080     16 x 16