Problem with 2-byte character input

[Bables55]

Steps to reproduce

1.Open the Collabora documents at Nextcloud(Collabora Office 5.3-57) with the Vivaldi browser.
2.Enable Japanese input mode
3.Enter Japanese

Expected behaviour

Characters are correctly entered

Actual behaviour

2-byte characters are regularly repeated twice.
I will explain with the alphabet)
I enter "NIHONGO". Then "NIHONGONIHONGO" is displayed on the screen.
When I enter sentences without leaving:
I enter "NihongoSCHOOLheikou". Then "NihongoSCHOOLheikouNihongoSCHOOLheikou".
When inputting by word:
I enter "Nihongo" -> "SCHOOL" -> "heikou". Then "NihongoNihongo" "SCHOOL" "heikouheikou".
As mentioned above, only 2-byte characters are consecutive twice.
This is not a problem with Firefox. Vivaldi(ver.2.0 or 2.1) (probably also Chrome) is occurring.
The type of Japanese input system(IME) seems to be related. The standard in Japanese is MS-IME.

Server configuration

Operating system:
CentOS 7.5
Web server:
eginx 1.13.8
Database:
MariaDB 10.2.18
PHP version:
PHP 7.1.23
Nextcloud version: (see Nextcloud admin page)
14.0.3
Updated from an older Nextcloud/ownCloud or fresh install:
from Nextcloud 13
Where did you install Nextcloud from:
Get official source
Signing status:

Signing status

No errors have been found.

The content of config/config.php:

Config report

"system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "NC DOMAIN",
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "https:\/\/NC DOMAIN",
        "dbtype": "mysql",
        "version": "14.0.3.0",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "log_type": "file",
        "logtimezone": "Asia\/Tokyo",
        "loglevel": 2,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "filelocking.enabled": true,
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379,
            "password": "***REMOVED SENSITIVE VALUE***"
        },
        "mail_smtpmode": "smtp",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpsecure": "ssl",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauth": 1,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "maintenance": false,
        "auth.bruteforce.protection.enabled": false,
        "versions_retention_obligation": "7,auto",
        "trashbin_retention_obligation": "auto",
        "defaultapp": "calendar",
        "theme": "",
        "updater.release.channel": "stable"
}

Client configuration

Browser:
Vivaildi 2.0, 2.1
Operating system:
Windows10 1803

[Bables55]

On smartphones, the problem is that characters are not fixed even if characters are entered. For example, although I input 5 characters(2-byte), only the first one character is definitely entered actually.
Apparently the current version does not seem to use 2-byte characters on Windows(Chromium type) or iPhone/iPad.

[Bables55]

I tried other Chromium type browsers. Vivaldi(Mac/Win), Canary(Win), Sleipnir(Mac/Win). All of them caused problems with 2-byte characters. Firefox(Mac/Win) has no problem. 2-byte character input on a smartphone is catastrophic.

LOOLWSD 4.0.0 / Collabora Office 6.0-18

[trytrytogo]

i have the same problems.
Collabora Server 1:Docker version 18.06.1-ce, build e68fc7a collabora/code:latest
Nextcloud Server 1:Docker version 18.06.0-ce, build 0ffa825 NC15
CentOS Linux release 7.4.1708 (Core) .10.0-693.5.2.el7.x86_64 #1 SMP Fri Oct 20 20:32:50 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

[Bables55]

Vivaldi has the ability to display web pages in the side panel. There seems NC recognized as a connection with Android, it looks like a mobile version. I can enter 2 byte characters without problems with Collabora's operation with NC in its side panel. Of course, 2 byte characters can not be entered correctly with iPhone.

And this is the same on the demo site of the Collabora website.

[trytrytogo]

@Bables55 hi,i create a account from Collabora website. For chinese, in chrome, it's wrong. i record a gif.https://i.bmp.ovh/imgs/2019/01/a807d4a79346aaa1.gif

[cedarice]

The same issuse in Chrome.

[Bables55]

I have confirmed that this problem is occurring on "Chromium" based browsers such as Canary and Brave. The only interesting thing is when I displayed NC in Vivaldi's sidebar. Vivaldi is a Chromium based browser. When it is displayed in the sidebar of it, the smartphone mode is set by CSS. Depending on the site, it may be recognized as Android. In this case, the user can normally input 2byte characters. Is there a clue to problem solving here?

The worst is the smartphone. On any browser on the iPhone, the user can only enter 2byte characters for the first single character.

[juliusknorr]

Thanks for your bug report. This issue tracker is only targeting the collabora integration inside Nextcloud. Your issue is actually related to Collabora/LibreOffice Online, so please head over to https://bugs.documentfoundation.org/enter_bug.cgi?product=LibreOffice%20Online for reporting.