[PATCH manager] ui: MultiDiskPanel: fix default LXC rootfs disk missing

[Filip Schauer <f.schauer@proxmox.com>]

Commit aecf27bd moved the initial disk addition from afterrender to
setNodename so that architecture-specific defaults are available when
the first disk is added in the VM creation wizard. However, the LXC
wizard never calls setNodename on the MultiMPPanel, so the initial disk
was never added and the Disks tab appeared empty.

Restore the afterrender fallback, gated on addedFirstDisk, so it is a
no-op when setNodename already fired but still triggers otherwise.

Fixes: aecf27bd (fix #7599: ui: qemu: wizard: fix disk controller for windows with second cd drive)
Signed-off-by: Filip Schauer <f.schauer@proxmox.com>
---
 www/manager6/panel/MultiDiskEdit.js | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/www/manager6/panel/MultiDiskEdit.js b/www/manager6/panel/MultiDiskEdit.js
index 3de07674..b202f3ac 100644
--- a/www/manager6/panel/MultiDiskEdit.js
+++ b/www/manager6/panel/MultiDiskEdit.js
@@ -33,9 +33,7 @@ Ext.define('PVE.panel.MultiDiskPanel', {
             let me = this;
             let view = me.getView();
             me.addDiskChecked(false);
-            if (!view.addedFirstDisk) {
-                view.addedFirstDisk = true;
-            }
+            view.addedFirstDisk = true;
         },
 
         onImport: function () {
@@ -225,6 +223,15 @@ Ext.define('PVE.panel.MultiDiskPanel', {
             'grid[reference=grid]': {
                 selectionchange: 'onSelectionChange',
             },
+            '#': {
+                afterrender: function (view) {
+                    let me = this;
+                    if (!view.addedFirstDisk) {
+                        me.onAdd();
+                        me.lookup('grid').getSelectionModel().select(0, false);
+                    }
+                },
+            },
         },
     },
 
-- 
2.47.3