ST doesn't apply transparency level for auto complete labels if `fg_blend` is disabled

Summary

Sublime Text doesn't apply transparency level for auto complete labels if fg_blend is false. Pretty similar to #1819. I've tried with default "theme_font_options" and ["directwrite"].

Expected behavior

Next code should work:

    {
        "class": "auto_complete_label",
        "fg": [255, 0, 0, 0.05],
        "match_fg": [255, 0, 0, 0.18],
        "selected_fg": [255, 0, 0, 0.5],
        "selected_match_fg": [255, 0, 0, 1.0],
        "fg_blend": false
    },

Actual behavior

Steps to reproduce

1. Open Default.sublime-theme
2. Edit auto_complete_label styles:

    {
        "class": "auto_complete_label",
        "fg": [255, 0, 0, 0.05],
        "match_fg": [255, 0, 0, 0.18],
        "selected_fg": [255, 0, 0, 0.5],
        "selected_match_fg": [255, 0, 0, 1.0],
        "fg_blend": false
    },
    {
        "class": "auto_complete_label",
        "parents": [{"class": "auto_complete", "attributes": ["file_light"]}],
        "fg": [0, 0, 0, 0.0],
        "match_fg": [0, 0, 0, 0.18],
        "selected_fg": [0, 0, 0, 0.0],
        "selected_match_fg": [0, 0, 0, 0.18],
        "fg_blend": false
    },

3. Trigger autocomplete.

Environment

• Operating system and version:
  • Windows 7
• Monitor:
  • 1920x1080
  • dpi_scale: 1.0
• Sublime Text:
  • Build 3142
  • 64 bit

ST 3146 fixes this with default settings at least.