Color picker alters RGB components when changing opacity

[DominoPivot]

• VSCode Version: 1.16.1 and 1.17.1
• OS Version: Ubuntu 17.04 64-bit and Windows 10 Enterprise 10.0.15063 Build 15063

Steps to Reproduce:

1. Create a CSS file with the following content.

.foo {
  color: rgb(92, 106, 196);
}

2. Use the color picker to change the opacity to a random value.
   The color has changed to rgba(92, 108, 196, 0.55) (note the wrong green component).

3. Close the color picker by clicking in the file.

4. Reopen the color picker, change the opacity again.
   The color has changed to rgba(92, 109, 196, 0.73).

This bug also occurs using the same color in hex format (#5c6ac4), but only affects some colors. I was just unlucky enough to use a problematic one and was surprised to see that some of the colors in our CSS code were off by a digit.

Reproduces without extensions: Yes