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21 lines
1.5 KiB
Markdown
21 lines
1.5 KiB
Markdown
# Main Window Desktop Layer
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## Requirements
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- Add a developer option named `EnableMainWindowDesktopLayer`.
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- When enabled, the main Lan Mountain desktop window behaves like a desktop-surface window: ordinary application windows can stay above it.
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- The feature is implemented as desktop-layer or bottom placement, not as `Topmost`.
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- The option is mutually exclusive with `EnableFusedDesktop`.
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- Enabling main-window desktop layer while fused desktop is enabled must ask for confirmation, then disable fused desktop on confirm or roll back on cancel.
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- Enabling fused desktop while main-window desktop layer is enabled must ask for confirmation, then disable main-window desktop layer on confirm or roll back on cancel.
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- Air APP windows remain ordinary application windows and must not be attached to the desktop layer.
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- On Windows, the main window should attach to the desktop icon host when available and fall back to `HWND_BOTTOM` when unavailable.
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- On non-Windows platforms, the setting may exist but the layer service is a no-op and must not throw.
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## Acceptance
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- Opening another app above Lan Mountain Desktop keeps that app visible when main-window desktop layer is enabled.
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- Restoring the main window from tray keeps the desktop-layer behavior and does not perform a temporary `Topmost` promotion.
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- Turning the option off restores normal main-window behavior as far as possible.
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- Fused desktop component windows keep their existing bottom-most behavior and remain isolated from the main-window service.
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