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高奕GaoYiandJason Lee 3229ac92c4 root: Add bordered option for layer-shell fullscreen windows (#2466 )

Add `Root::borderless()` so that layer-shell fullscreen surfaces
(greeter, lock screen, screensaver, panel taskbar, etc.) can skip the
Linux CSD `window_border` wrapper, which otherwise paints an unwanted
border and shadow around an edge-to-edge surface.

When `borderless` is set, `Root::render` returns the inner content
directly instead of wrapping it in `window_border()`. The default is
`false`, so existing behavior is unchanged.

## Description

On Linux, `Root::render` always wraps its content in `window_border()`
to draw client-side decoration borders and shadows. For layer-shell
fullscreen surfaces (greeters, lock screens, screensavers, panels, etc.)
this wrapper is undesirable: such surfaces are edge-to-edge and should
not have a border or drop shadow around them.

This PR adds an opt-in `Root::borderless(bool)` builder method backed by
a `borderless: bool` field (default `false`). When `borderless` is
`true`, `Root::render` returns the inner content element directly;
otherwise it keeps wrapping the content in
`window_border().shadow_size(...)` exactly as before. Both branches end
with `.into_any_element()` so the return type is unified.

Because the default is `false`, all existing windows are unaffected.

## Break Changes

None.

## How to Test

- `cargo build -p gpui-component`
- On Linux with client-side decorations, set `Root::borderless(true)` on
a layer-shell fullscreen surface and confirm the border and shadow are
no longer drawn around it.
- Confirm that a default `Root` (without `borderless`, or
`borderless(false)`) still renders the usual border and shadow.

## Checklist

- [ ] I have read the [CONTRIBUTING](../CONTRIBUTING.md) document and
followed the guidelines.
- [x] Reviewed the changes in this PR and confirmed AI generated code
(If any) is accurate.
- [ ] Passed `cargo run` for story tests related to the changes.
- [ ] Tested macOS, Windows and Linux platforms performance (if the
change is platform-specific)

---------

Co-authored-by: Jason Lee <huacnlee@gmail.com>

2026-06-15 10:46:19 +08:00

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 [package]
 name = "root_borderless"
 description = "Example demonstrating disabling Root's window border wrapper."
 version = "0.5.1"
 publish = false
 edition.workspace = true
 [dependencies]
 gpui.workspace = true
 gpui_platform.workspace = true
 gpui-component = { workspace = true }
 [lints]
 workspace = true