Fix z-index issue in terminal inline chat suggest

[bangseongbeom]

Increase terminal z-index to resolve #295960.

Set z-index to 12 since the scrollbar is 11.

[Copilot]

Pull request overview

This PR fixes a z-index stacking issue where the scrollbar and active item indicator were rendering on top of the terminal inline chat's suggest widget. The fix elevates the terminal container's z-index from 0 to 12, positioning it above the scrollbar (z-index 11) while maintaining proper stacking context.

Changes:

• Increased .pane-body.integrated-terminal z-index from 0 to 12 to ensure terminal UI elements appear above the scrollbar

[meganrogge]

@bangseongbeom let's add specificity to the css selector so it only does this in the terminal inline chat

[bangseongbeom]

@meganrogge I tried that, but we need to remove the terminal's stacking context first.

Since the inline chat is inside the terminal, and the terminal has z-index: 0, increasing z-index of elements inside the terminal won't solve the problem. This is because no matter how high we set the z-index of any element inside the terminal, it cannot be placed above the scrollbar.

The .monaco-editor .suggest-widget already has z-index: 40, so if we just remove the terminal's stacking context (remove the z-index), it should work.

However, we need to be careful because doing this basically reverts @tisilent's commit 0768cbe.

[meganrogge]

With your change, I see this in the terminal, which we do not want.

[tisilent]

Maybe #175890 . 🤯

[bangseongbeom]

With your change, I see this in the terminal, which we do not want.

Maybe #175890 . 🤯

Hmm… as you showed, it seems impossible to remove the z-index from the terminal.

If the terminal should have z-index: 0 (its original state), then no matter how high you set the z-index of its child elements, it doesn't working. The terminal establishes its own stacking context with z-index: 0, so it and its descendants will always be stacked below the scrollbar (z-index: 11).

As I suggested at the beginning, the best option seems to be setting the terminal's z-index higher than the scrollbar's. I reverted it.