High Contrast Themes Missing Selected Marking for Trees

[colin-grant-work]

Bug Description:

In high-contrast themes, there is no marking of the selected item in trees:

VSCode (note orange border in tree and on tab):

Theia (note absence of marking in both tree and tab):

Steps to Reproduce:

1. Open application
2. Set theme to high-contrast (either one)
3. Select an item in a tree.
4. Note that there is no indication of selection

Additional Information

Areas where marking is missing:

• Trees

• Tab bars

• Quick picks
  (Feel free to point out more, if you notice any)

• Operating System: RHEL7 (Electron)

• Theia Version: 05f289b

[vince-fugnitto]

@colin-grant-work should we close #6743 in favor of this issue?

[colin-grant-work]

It looks like #7353 has about the same amount of detail that I have, so maybe we close this one and #6743 in favor of that?

[vince-fugnitto]

It looks like #7353 has about the same amount of detail that I have, so maybe we close this one and #6743 in favor of that?

Up to you :) Let's keep one open for sure.

[colin-grant-work]

Closing in favor of #6743, which has several more missing high-contrast theme areas in its comments.