[FIX] account_financial_report: 2 things:

* Fix account group level computation

  Depends was not correct for recomputing when needed + better algorithm

* Make hide details on 0 work properly

  * Passing values to general ledger was stripping some correct records
  * Computed field for hiding lines doesn't have proper dependencies nor is not
    taking into account float currency accuracy

account_financial_report/models/account_group.py

@@ -25,15 +25,13 @@ class AccountGroup(models.Model):
         string="Accounts", store=True)
 
     @api.multi
-    @api.depends('parent_id')
+    @api.depends('parent_id', 'parent_id.level')
     def _compute_level(self):
         for group in self:
-            level = 0
-            new_group = group
-            while new_group.parent_id:
-                level += 1
-                new_group = new_group.parent_id
-            group.level = level
+            if not group.parent_id:
+                group.level = 0
+            else:
+                group.level = group.parent_id.level + 1
 
     @api.multi
     @api.depends('code_prefix', 'account_ids', 'account_ids.code',

account_financial_report/report/trial_balance.py

@@ -3,6 +3,7 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 from odoo import models, fields, api
+from odoo.tools import float_is_zero
 
 
 class TrialBalanceReport(models.TransientModel):
@@ -114,16 +115,26 @@ class TrialBalanceReportAccount(models.TransientModel):
         inverse_name='report_account_id'
     )
 
-    @api.multi
+    @api.depends(
+        'currency_id',
+        'report_id',
+        'report_id.hide_account_at_0',
+        'report_id.limit_hierarchy_level',
+        'report_id.show_hierarchy_level',
+        'initial_balance',
+        'final_balance',
+        'debit',
+        'credit',
+    )
     def _compute_hide_line(self):
         for rec in self:
             report = rec.report_id
-            rec.hide_line = False
+            r = (rec.currency_id or report.company_id.currency_id).rounding
             if report.hide_account_at_0 and (
-                    not rec.initial_balance and
-                    not rec.final_balance and
-                    not rec.debit and
-                    not rec.credit):
+                    float_is_zero(rec.initial_balance, precision_rounding=r)
+                    and float_is_zero(rec.final_balance, precision_rounding=r)
+                    and float_is_zero(rec.debit, precision_rounding=r)
+                    and float_is_zero(rec.credit, precision_rounding=r)):
                 rec.hide_line = True
             elif report.limit_hierarchy_level and \
                     rec.level > report.show_hierarchy_level:
@@ -213,7 +224,8 @@ class TrialBalanceReportCompute(models.TransientModel):
             'date_from': self.date_from,
             'date_to': self.date_to,
             'only_posted_moves': self.only_posted_moves,
-            'hide_account_at_0': self.hide_account_at_0,
+            # This is postprocessed later with a computed field
+            'hide_account_at_0': False,
             'foreign_currency': self.foreign_currency,
             'company_id': self.company_id.id,
             'filter_account_ids': [(6, 0, account_ids.ids)],