[FIX] web: edited password fields should not contain '*'

Before this commit, when someone was editing a password, the stored
password may not be the expected one by the user.

Steps to reproduce:

	1. Open "Outgoing Mail Servers" form.
	2. Set a password (e.g. "yop").
	3. Save, then edit.
	4. Add "y" at the end of the password field.

	> Expected value: "yopy"
	> Actual value: "***y"

This is due to the use of the char field formatter, which displays passwords
by replacing the characters with '*'. It is not necessary to do this in edit
mode, because it uses an input field of type 'password'. The browser
automatically hides the value of such inputs.

Any changes on a input field in edit mode uses the value of the input, so the
value of an password input should contain the password, without '*'.

This commit fixes the issue by using the formatter in edit mode for the input
of type 'password'.

Task-ID 1869565

addons/web/static/src/js/fields/basic_fields.js

@@ -243,14 +243,20 @@ var InputField = DebouncedField.extend({
     _prepareInput: function ($input) {
         this.$input = $input || $("<input/>");
         this.$input.addClass('o_input');
-        this.$input.attr({
-            type: this.nodeOptions.isPassword ? 'password' : 'text',
-            placeholder: this.attrs.placeholder || "",
-            autocomplete: this.nodeOptions.isPassword ?
-                'new-password' :
-                this.attrs.autocomplete,
-        });
-        this.$input.val(this._formatValue(this.value));
+
+        var inputAttrs = { placeholder: this.attrs.placeholder || "" };
+        var inputVal;
+        if (this.nodeOptions.isPassword) {
+            inputAttrs = _.extend(inputAttrs, { type: 'password', autocomplete: 'new-password' });
+            inputVal = this.value;
+        } else {
+            inputAttrs = _.extend(inputAttrs, { type: 'text', autocomplete: this.attrs.autocomplete });
+            inputVal = this._formatValue(this.value);
+        }
+
+        this.$input.attr(inputAttrs);
+        this.$input.val(inputVal);
+
         return this.$input;
     },
     /**

addons/web/static/tests/fields/basic_fields_tests.js

@@ -1183,6 +1183,34 @@ QUnit.module('basic_fields', {
         form.destroy();
     });
 
+    QUnit.test('input field: change password value', function (assert) {
+        assert.expect(4);
+
+        var form = createView({
+            View: FormView,
+            model: 'partner',
+            data: this.data,
+            arch: '<form>' +
+                    '<field name="foo" password="True"/>' +
+                '</form>',
+            res_id: 1,
+        });
+
+        assert.notOk(form.$('.o_field_char').text() === "yop",
+            "password field value should not be visible in read mode");
+        assert.strictEqual(form.$('.o_field_char').text(), "***",
+            "password field value should be hidden with '*' in read mode");
+
+        form.$buttons.find('.o_form_button_edit').click();
+
+        assert.strictEqual(form.$('input.o_field_char').attr('type'), 'password',
+            "password field input should be with type 'password' in edit mode");
+        assert.strictEqual(form.$('input.o_field_char').val(), 'yop',
+            "password field input value should be the (non-hidden) password value");
+
+        form.destroy();
+    });
+
     QUnit.module('UrlWidget');
 
     QUnit.test('url widget in form view', function (assert) {

addons/web/static/tests/views/form_tests.js

@@ -6046,8 +6046,8 @@ QUnit.module('Views', {
         assert.strictEqual(form.$('span[name="foo"]').text(), '***',
             "password should be displayed with stars");
         form.$buttons.find('.o_form_button_edit').click();
-        assert.strictEqual(form.$('input[name="foo"]').val(), '***',
-            "password should be displayed with stars");
+        assert.strictEqual(form.$('input[name="foo"]').val(), 'yop',
+            "input value should be the password");
         assert.strictEqual(form.$('input[name="foo"]').prop('type'), 'password',
             "input should be of type password");
         form.destroy();
@@ -6068,8 +6068,8 @@ QUnit.module('Views', {
         });
 
         form.$buttons.find('.o_form_button_edit').click();
-        assert.strictEqual(form.$('input[name="foo"]').val(), '***',
-            "password should be displayed with stars");
+        assert.strictEqual(form.$('input[name="foo"]').prop('type'), 'password',
+            "input should be of type password");
         assert.strictEqual(form.$('input[name="display_name"]').attr('autocomplete'), 'coucou',
             "attribute autocomplete should be set");
         assert.strictEqual(form.$('input[name="foo"]').attr('autocomplete'), 'new-password',