`reorder_imports=false` conflicts with `imports_indent="Visual"`

When using both imports_indent="Visual" and reorder_imports=false the alignments of all subsequent lines within the block are off by 4 spaces.

To Reproduce
source:

// rustfmt-imports_indent: Visual
// rustfmt-reorder_imports: false

use module::{
  submodule_A::{Type_A1, Type_A2},
  submodule_B::{Type_B1, Type_B2},
};

target:

// rustfmt-imports_indent: Visual
// rustfmt-reorder_imports: false

use module::{submodule_A::{Type_A1, Type_A2},
         submodule_B::{Type_B1, Type_B2}};

Expected behavior

// rustfmt-imports_indent: Visual
// rustfmt-reorder_imports: false

use module::{submodule_A::{Type_A1, Type_A2},
             submodule_B::{Type_B1, Type_B2}};

Note that:

1. The correct thing happens when either imports_indent="Visual" or reorder_imports=false is set, but not when they are both set simultaneously.
2. No reordering of modules needs to actually happen (or be prevented from happening) for this to occur.

Meta

• rustfmt version: 94035f9148d31d3f714d9c649cf2de0f0edb4f46 (HEAD -> master)

refs #3360

Start by running the supplied rustfmt reproduction with imports_indent="Visual" and reorder_imports=false, comparing the generated alignment with the expected output. Trace the formatting path for nested imports and verify that subsequent lines use the expected indentation when both options are enabled; done means the example formats exactly as shown.