Debounce video pause event in some chromium browsers

svelte/src/file_viewer/FileViewer.svelte

@@ -324,7 +324,10 @@ const keyboard_event = evt => {
 			}
 			break
 		case " ": // Spacebar pauses / unpauses video and audio playback
-			file_preview.toggle_playback()
+			if (file_preview.toggle_playback()) {
+				evt.preventDefault()
+				evt.stopPropagation()
+			}
 			break
 		case "h":
 			file_preview.seek(-20)

svelte/src/file_viewer/viewers/FilePreview.svelte

@@ -50,7 +50,9 @@ export const set_file = async file => {
 export const toggle_playback = () => {
 	if (viewer && viewer.toggle_playback) {
 		viewer.toggle_playback()
+		return true
 	}
+	return false
 }
 export const seek = delta => {
 	if (viewer && viewer.seek) {