Fix HFilter find functions

TODO.md

@@ -3,6 +3,7 @@
 - add account number binds
 - rename goto*account → scrollto*account
 
+- fix up/down type error when filtering
 - fix opacity
 - fix python error
 - fix back/front buttons in small window

src/gui/Base/HFilterModel.qml

@@ -34,17 +34,17 @@ DelegateModel {
         for (let i = 0; i < items.count; i++) refilterAt(i)
     }
 
-    function filteredFindIndex(id) {
+    function filteredFindIndex(id, default_=null) {
         for (let i = 0; i < filtered.count; i++)
             if (filtered.get(i).id === id) return i
 
-        return null
+        return default_
     }
 
-    function filteredFind(id) {
+    function filteredFind(id, default_=null) {
         for (let i = 0; i < filtered.count; i++)
             if (filtered.get(i).id === id) return get(i)
 
-        return null
+        return default_
     }
 }

src/gui/MainPane/AccountsBar.qml

@@ -32,7 +32,7 @@ HColumnLayout {
         currentIndex:
             roomList.currentIndex === -1 ?
             -1 :
-            model.findIndex(
+            model.filteredFindIndex(
                 roomList.model.filtered.get(
                     roomList.currentIndex,
                 ).model.for_account,