Michail Vourlakos c86878f6c7 [indicators api] - new background corner margin
--introducing in Indicators API a new option to
specify the indicator preference for the distance
between the indicator and panel background roundness.
By altering the option the indicator can get into
the panel background roundness.

BUG:442675
..
bridge
client [indicators api] - new background corner margin
definition [indicators api] - new background corner margin
host
items respect indicators iconOffsetX/Y values properly