Use current record context when rendering email templates

Pass the current record context from the email dialog when fetching
template values and defaults. This keeps context-dependent models,
including table_query records, addressable after the user changes the
context.

Closes #14565

sao/src/window.js

@@ -2727,15 +2727,16 @@
         },
         _fill_with: function(template) {
             var prm;
+            let context = this.record.get_context();
             if (template) {
                 prm = Sao.rpc({
                     'method': 'model.ir.email.template.get',
-                    'params': [template, this.record.id, {}],
+                    'params': [template, this.record.id, context],
                 }, this.record.model.session);
             } else {
                 prm = Sao.rpc({
                     'method': 'model.ir.email.template.get_default',
-                    'params': [this.record.model.name, this.record.id, {}],
+                    'params': [this.record.model.name, this.record.id, context],
                 }, this.record.model.session);
             }
             prm.then(values => {

tryton/tryton/gui/window/email_.py

@@ -291,14 +291,16 @@ class Email(NoModal):
 
     def _fill_with(self, template=None):
         try:
+            context = self.record.get_context()
             if template:
                 values = RPCExecute(
                     'model', 'ir.email.template', 'get',
-                    template, self.record.id)
+                    template, self.record.id, context=context)
             else:
                 values = RPCExecute(
                     'model', 'ir.email.template', 'get_default',
-                    self.record.model_name, self.record.id)
+                    self.record.model_name, self.record.id,
+                    context=context)
         except RPCException:
             return
         self.to.set_text(', '.join(values.get('to', [])))