Find/Replace Overlay: adapt to target theming

[Wittmaxi]

The find/replace overlay now gets it's colors from the targetted view if the target is a text editor.

fixes #2118

Before:

Light theme:

[Wittmaxi]

@thomasritter @BeckerWdf You are closer to the theme revamp than I am. What do you think of this change? Is this the best way to apply your theme to our overaly?

[github-actions]

Test Results

 1 815 files  ±0   1 815 suites  ±0   1h 39m 27s ⏱️ + 5m 2s
 7 679 tests ±0   7 451 ✅ +1  228 💤 ±0  0 ❌  - 1 
24 198 runs  ±0  23 449 ✅ +1  749 💤 ±0  0 ❌  - 1 

Results for commit be8946a. ± Comparison against base commit b502ad7.

[thomasritter]

Thanks for the heads-up. I will start using it to get a feel for it.

We usually look at other applications for inspirations first. So, I would recommend that you look at:

• VS Code
• Intellij
• Firefox, Chrome
• Notepad
• ...

See how they integrated it. Get some inspirations and find out what makes most sense in the Eclipse environment.

[Wittmaxi]

@thomasritter Do you think it would make sense to merge this as a kind of "dogfooding"-PR and possibly change or revert it later on?

IntelliJ has the search themed to match with the Editor:

VScode does the same (except vscode has the editor lighter than the outside)

The windows editor has a "real overlay", I don't think it really applies to our case

Based on this, I believe that my change is an improvement for the theming. In any case, the new change in theming makes the Overlay stick out like a sore thumb - we should find some solution for it

[vogella]

LGTM