iStyle arguments ignored when iStyle.style is not Indent Only

[hw770]

Describe the bug
Arguments "-s2" that should be passed to iStyle was ignored when I choose "K&R" style.

Environment :

• Extension version 1.13.0

Steps to reproduce
My iStyle formatter settings:

{
    "verilog.formatting.iStyleVerilogFormatter.style": "K&R",
    "verilog.formatting.iStyleVerilogFormatter.arguments": "-s2"
}

Expected behavior
Format verilog file in K&R style, indent size 2.

Actual behavior
Format result:
The file's indent size is 4. The argument -s2 is ignored.

Additional context
I guess the reason is the two commands below behaves differently:
istyle --style=kr -s2 .\src\DM.v
istyle -s2 --style=kr .\src\DM.v
The formmer result in indentsize=2, the latter 4.
So, changing the settings into

{
    "verilog.formatting.iStyleVerilogFormatter.style": "Indent Only",
    "verilog.formatting.iStyleVerilogFormatter.arguments": " --style=kr -s2"
}

works.