Layout/AssignmentIndentation vs Layout/FirstArgumentIndentation confuse each other

[zverok]

We have (a bit unusual, I agree) this setting:

Layout/AssignmentIndentation:
  IndentationWidth: 4

(The reasoning of person who introduced this is "not to mix assignments with new block starts").

Now, considering these two cases:

# 1
foo =
    bar
# 2
foo.baz =
    bar

(1) is OK (4 spaces indentation). (2) is OK with this cop, but ...

C: [Correctable] Layout/FirstArgumentIndentation: Indent the first argument one step more than the start of the previous line.
    bar
    ^^^

And if you try to auto-correct it...

rbcp.rb:10:3: C: [Corrected] Layout/AssignmentIndentation: Indent the first line of the right-hand-side of a multi-line assignment.
  bar
  ^^^
rbcp.rb:10:5: C: [Corrected] Layout/FirstArgumentIndentation: Indent the first argument one step more than the start of the previous line.
    bar
    ^^^

0 files inspected, 2 offenses detected, 2 offenses corrected
Infinite loop detected in /home/zverok/playground/ruby/rbcp.rb and caused by Layout/FirstArgumentIndentation -> Layout/AssignmentIndentation

I understand where it comes from (this statement is kinda both "assignment" and "method call"), but it seems to me that the "assignment" should take a priority here... And in any case, infinite loop seems the sub-optimal behavior :)