fix #6874: ui: node selectors: sort memory usage by percentage

The memory usage column of the node selector, used e.g. in the
migration dialog, and of the HA node priority selector shows a
percentage, but uses the raw 'mem' bytes as data index. Sorting by that
column thus sorts by used bytes, which does not match the displayed
values as soon as the nodes have a different amount of memory.

Add a calculated 'memuse' field, like the resource store already has,
and use it for the column. This also makes the percentage renderer
receive a ratio here, like everywhere else, which allows dropping its
bytes fallback in a follow-up.

Signed-off-by: Michal Fox <me@dualfroz.com>

www/manager6/ha/NodePrioritySelector.js

@@ -23,7 +23,17 @@ Ext.define('PVE.forms.NodePrioritySelector', {
 
     store: {
         autoLoad: true,
-        fields: ['node', 'cpu', 'mem', 'priority'],
+        fields: [
+            'node',
+            'cpu',
+            'mem',
+            'priority',
+            {
+                name: 'memuse',
+                type: 'number',
+                calculate: PVE.Utils.calculate_mem_usage,
+            },
+        ],
         proxy: {
             type: 'proxmox',
             url: '/api2/json/nodes',
@@ -47,7 +57,7 @@ Ext.define('PVE.forms.NodePrioritySelector', {
             renderer: PVE.Utils.render_mem_usage_percent,
             sortable: true,
             width: 150,
-            dataIndex: 'mem',
+            dataIndex: 'memuse',
         },
         {
             header: gettext('CPU usage'),