xP: bind buffer iteration to M-PageUp/PageDown

xP/public/xP.js

@@ -817,11 +817,8 @@ document.addEventListener('keydown', event => {
 	if (rpc.ws == undefined || !hasShortcutModifiers(event))
 		return
 
+	let names = undefined
 	switch (event.key) {
-	case 'Tab':
-		if (bufferLast !== undefined)
-			bufferActivate(bufferLast)
-		break
 	case 'h':
 		bufferToggleLog()
 		break
@@ -839,6 +836,26 @@ document.addEventListener('keydown', event => {
 				break
 			}
 		break
+	case 'Tab':
+		if (bufferLast !== undefined)
+			bufferActivate(bufferLast)
+		break
+	case 'PageUp':
+		names = [...buffers.keys()]
+		for (let i = 0; i < names.length; i++)
+			if (names[i] === bufferCurrent) {
+				bufferActivate(names.at(--i))
+				break
+			}
+		break
+	case 'PageDown':
+		names = [...buffers.keys()]
+		for (let i = 0; i < names.length; i++)
+			if (names[i] === bufferCurrent) {
+				bufferActivate(names.at(++i) || names[0])
+				break
+			}
+		break
 	default:
 		return
 	}