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?
result = []
        for line in self:
            if line.ref:
                result.append((line.id, (line.move_id.name or '') + '(' + line.ref + ')'))
            else:
                result.append((line.id, line.move_id.name))
        return result
    @api.model
    def compute_amount_fields(self, amount, src_currency, company_currency, invoice_currency=False):
        """ Helper function to compute value for fields debit/credit/amount_currency based on an amount and the currencies given in parameter"""
        amount_currency = False
        currency_id = False
        if src_currency and src_currency != company_currency:
            amount_currency = amount
            amount = src_currency.with_context(self._context).compute(amount, company_currency)
            currency_id = src_currency.id
        debit = amount > 0 and amount or 0.0
        credit = amount < 0 and -amount or 0.0
        if invoice_currency and invoice_currency != company_currency and not amount_currency:
            amount_currency = src_currency.with_context(self._context).compute(amount, invoice_currency)
            currency_id = invoice_currency.id
        return debit, credit, amount_currency, currency_id
    @api.multi
    def create_analytic_lines(self):