This is a follow-up of gitkraken/vscode-gitlens-private#81

We use following colors for the view background and for the card background:

• --color-view-background
• --vscode-textBlockQuote-background

However, on some themes they are the same color.

I want to build the card background based on --vscode-descriptionForeground that is always contrast to the background. For example a card can have a semitransparent color, or maybe it should be even some mix of --vscode-descriptionForeground and --color-view-background.

Fixed in 47d0652

Before:

After: