Indentation issues in multiline template literals

[jonsmithers]

Description

Auto-indent affects the indentation of all lines within a template literal. It seems to me that template literal contents should not be changed at all. Additionally, indentation for lines following a template literal should not be affected by indentation of the contents of the template literal.

To Reproduce

1. Run vim --clean (to test runtime file packaged with vim)
2. set ft=typescript
3. Paste the following

const string = `
  when auto-indented, this line should not be changed
`;

const string = `
  (arbitrary nonsense)`;
  log('when auto-indented, this line should de-dented');

4. Auto-indent line 2 (2G==). Observe that it is de-dented. It is expected to be unchanged.
5. Auto-indent line 7 (7G==). Observe that it is not de-dented. It is expected to be de-dented.

Environment:

• Vim: 8.1.2402
• OS: Fedora 30
• Terminal: Tilix

Additional context

(FYI, this issue is of interest to me because I currently maintain a "vim-html-template-literals" plugin that amends various js/ts syntax plugins to support html syntax inside of tagged template literals, which is useful when working with lit-html).