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fix(desktop): prevent webview from swallowing mosaic drag events #2772

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Merged
Kitenite merged 1 commit into from
Mar 23, 2026
Merged

fix(desktop): prevent webview from swallowing mosaic drag events #2772

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22 changes: 22 additions & 0 deletions ...ntView/TabsContent/TabView/BrowserPane/hooks/usePersistentWebview/usePersistentWebview.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,28 @@ function getHiddenContainer(): HTMLDivElement {
return hiddenContainer;
}

// ---------------------------------------------------------------------------
// Disable webview interaction during ANY drag operation.
// Electron <webview> tags create separate compositor layers that swallow
// drag events before they reach the mosaic drop targets. Setting
// pointer-events:none directly on the <webview> element tells the
// compositor to stop routing events to the guest process.
//
// We use native HTML5 drag events (capture phase) rather than the drag pane
// store because the store only covers mosaic pane drags — not tab-bar drags
// or other drag sources.
// ---------------------------------------------------------------------------

function setWebviewsDragPassthrough(passthrough: boolean) {
for (const webview of webviewRegistry.values()) {
webview.style.pointerEvents = passthrough ? "none" : "";
}
}

window.addEventListener("dragstart", () => setWebviewsDragPassthrough(true), true);
window.addEventListener("dragend", () => setWebviewsDragPassthrough(false), true);
window.addEventListener("drop", () => setWebviewsDragPassthrough(false), true);

/** Call from useBrowserLifecycle when a pane is removed. */
export function destroyPersistentWebview(paneId: string): void {
const webview = webviewRegistry.get(paneId);
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