In normal mode selection has one extra character due to the cursor position

[germtb]

Describe the bug
When setting a selection programatically n an editor in normal mode the cursor is incorrectly positioned, which causes problems for other commands (e.g. copy).

To Reproduce
Change an editor selection programatically while in normal mode:

editor.selection = new vscode.Selection(
        start.line,
        start.character,
        end.line,
        end.character
);

See that the cursor is at the last character

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
Selection in normal mode places the cursor on the character before to the last.

Screenshots
Selection in normal mode:

Selection works fine without vim extension, and in insert mode:

Environment (please complete the following information):

• Extension (VsCodeVim) version: 1.3.0
• VSCode version: 1.3.3
• OS: Mojave 10.14.3

Additional context
I encountered this when writing my own plugin: https://github.com/germtb/vscode-token-navigation

[stevenguh]

This might be a duplicate of #1806