The '=' format incorrectly with certain code style when reset tabsize

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Is this a BUG REPORT or FEATURE REQUEST? (choose one): bug report

Environment:

• VSCode Version: 1.18.0
• VsCodeVim Version: 0.10.3
• OS: windows 10.0.16299.19

What happened:
Given code like this:

// tabSize = 4
function test() {
----const {
------success,
------result,
------error
----} = data;
}

Then and select the whole block and change the tab size to 2, then press equal(=) mark to re-format:

// tabSize = 2
function test() {
--const {
  ------success, // this line doesn't align correctly
  --result,
  --error
  --} = data; // this line too
}

What did you expect to happen:
All lines should be 2 space indented

// tabSize = 2
function test() {
--const {
  --success, // this line doesn't align correctly
  --result,
  --error
  } = data; // this line too
}

How to reproduce it:

Reproduce the issue in VSCodeVim using the JavaScript destructuring block, changing tabSize from 4 to 2 and invoking the = command on the selected block. Trace the visual-mode = formatting entry point and verify that every line receives the expected two-space indentation after the tab-size change.