xC/xP: implement M-H in the web frontend

xP/public/xP.js

@@ -194,6 +194,10 @@ function bufferActivate(name) {
 	rpc.send({command: 'BufferActivate', bufferName: name})
 }
 
+function bufferToggleUnimportant(name) {
+	rpc.send({command: 'BufferToggleUnimportant', bufferName: name})
+}
+
 function bufferToggleLog() {
 	if (bufferLog) {
 		setTimeout(() =>
@@ -860,6 +864,10 @@ document.addEventListener('keydown', event => {
 	case 'h':
 		bufferToggleLog()
 		break
+	case 'H':
+		if (bufferCurrent !== undefined)
+			bufferToggleUnimportant(bufferCurrent)
+		break
 	case 'a':
 		for (const name of names.slice(1))
 			if (buffers.get(name).newMessages) {