Home directory `~` not expanded in command mode

Describe the bug

pwd
/Users/zach/Projects

I enter command mode and tabedit a file :tabedit ~/.bashrc for example. The output is

Unable to open '.bashrc': Unable to read file '/Users/zach/Projects/~/.bashrc' (Error: Unable to resolve non-existing file '/Users/zach/Projects/~/.bashrc').

Another bug is if I have the directory /Users/zach/Projects/test-project and run :tabedit test-pr<tab> a tab is inserted where my cursor was in the file instead of the expected behavior of auto-completing test-project.

I believe these issues are caused by the same thing.

To Reproduce
Steps to reproduce the behavior:
Open a file and attempt to tabedit open some other file. Also try opening a file with ~

Expected behavior
I expect ~/.bashrc to be opened in the first case and test-project to be auto completed without any tabs inserted in my file in the second case.

Screenshots
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If remapping-related, please attach log output: https://github.com/VSCodeVim/Vim#debugging-remappings.

Environment (please complete the following information):

• Extension (VsCodeVim) version: 1.13.1
• VSCode version: 1.43.2
• OS: OSX Catalina 10.15.3

Additional context
Add any other context about the problem here.

Reproduce the issue in command mode with :tabedit ~/.bashrc and with filename completion such as :tabedit test-pr<Tab>. Trace the command-mode handling for path expansion and completion, then verify that ~/.bashrc opens from the home directory and completion does not insert a tab into the edited file.