Cannot select text from bottom to top using shift+mouse

Describe the bug
Cannot select text from bottom to top using shift+mouse, but select from top to bottom is working properly.

To Reproduce
Steps to reproduce the behavior:

1. Locate cursor at }
2. Shift + Left-click at be

<InlineToolbar>
  {
    // may be use React.Fragment instead of div to improve perfomance after React 16
           ^ 2. Shift + Left-click here
    (externalProps) => (
      <div>
        <BoldButton {...externalProps} />
        <ItalicButton {...externalProps} />
        <UnderlineButton {...externalProps} />
        <CodeButton {...externalProps} />
        <Separator {...externalProps} />
        <UnorderedListButton {...externalProps} />
        <OrderedListButton {...externalProps} />
        <BlockquoteButton {...externalProps} />
        <CodeBlockButton {...externalProps} />
      </div>
    )
  }
  ^ 1. Locate cursor here
</InlineToolbar>

Expected behavior
Select a bunch of text

Screenshots
vscodevim.20200916.mov.zip

Environment (please complete the following information):

• Extension (VsCodeVim) version: v1.16.0
• VSCode version: 1.49.0
• OS: macOS 10.15.6

The issue names no source file or test; first reproduce the reverse Shift+mouse selection failure in VSCodeVim on the stated VSCode, extension, and macOS versions, then trace the extension's selection handling entry point. Done means selecting from the bottom to the top works consistently while the existing top-to-bottom behavior remains intact.