Impacted versions:
At least version 10, version 11(Can only re-produce the problem sometimes)

Steps to reproduce:
Please see this screencast recorded on odoo runbot.
https://youtu.be/cSPQvp9jQJc

Current behavior:
When users search by account in Journal Entries List View. A special value "dummy_account_id" is set in context, in order to facilitate search by account on account.move level.
With this context value , when users create a journal entries, the system will add default value before the creation.

https://github.com/odoo/odoo/blob/fc69b37cf710623ea215cd085e998679d8c50985/odoo/models.py#L3802

This method will set "dummy_account_id" to the previously searched account in vals.

Then the system continue creating account.move and related account.move.line records.
It is fine until the system run this:
https://github.com/odoo/odoo/blob/fc69b37cf710623ea215cd085e998679d8c50985/odoo/models.py#L3830

Since "dummy_account_id" is related field, and it now has value. The system will change the first related  account.move.line record to dummy_account_id.

Eventualy, the account is wrongly set to "dummy_account_id".

Expected behavior:
This is a feature which will fill the form field value with searched value for users. But the journal entry creation should not be affected by dummy_account_id, since it is only for searching purpose.

@Yenthe666 Would you please review this issue and help to bring related odoo staff to this issue?
addons/account/models/account_move.py
#Rec
        amount_reconcile = min(sm_debit_move[field], -sm_credit_move[field])
        #Rem
        if amount_reconcile == sm_debit_move[field]:
            self -= sm_debit_move
        if amount_reconcile == -sm_credit_move[field]:
            self -= sm_credit_move
        #Che
        currency = False
        amount_reconcile_currency = 0
        if sm_debit_move.currency_id == sm_credit_move.currency_id and sm_debit_move.currency_id.id:
            currency = sm_credit_move.currency_id.id
            amount_reconcile_currency = min(sm_debit_move.amount_residual_currency, -sm_credit_move.amount_residual_currency)
        amount_reconcile = min(sm_debit_move.amount_residual, -sm_credit_move.amount_residual)
        if self._context.get('skip_full_reconcile_check') == 'amount_currency_excluded':
            amount_reconcile_currency = 0.0
            currency = self._context.get('manual_full_reconcile_currency')
        elif self._context.get('skip_full_reconcile_check') == 'amount_currency_only':
            currency = self._context.get('manual_full_reconcile_currency')
        self.env['account.partial.reconcile'].create({
            'debit_move_id': sm_debit_move.id,
            'credit_move_id': sm_credit_move.id,
            'amount': amount_reconcile,
            'amount_currency': amount_reconcile_currency,
            'currency_id': currency,
        })
        #Ite
        return self.auto_reconcile_lines()
    @api.multi
    def reconcile(self, writeoff_acc_id=False, writeoff_journal_id=False):