Chromium + Fcitx Input Charactor Loss

[Wei Tsui]

Ubuntu 18.04

1) Install Chromium & fcitx-googlepinyin via apt-get;

2) Open www.baidu.com, see the searching input block;

3) Using Fcitx Googlepinyin to "Quickly" input some chinese words;

4) When "searching input block" reset its style/position, some Fcitx Input charactor loss, and it is expected to be handled by Fcitx input table. For examples, when I input "shanghai" via Fcitx, I got "shnghai" in Fcitx table and "a" is located outside.

5) This bug doesn't happen with same steps above on Ubuntu 16.04.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: chromium-browser 63.0.3239.132-0ubuntu1
ProcVersionSignature: Ubuntu 4.14.0-15.18-generic 4.14.12
Uname: Linux 4.14.0-15-generic x86_64
ApportVersion: 2.20.8-0ubuntu6
Architecture: amd64
CurrentDesktop: MATE
DRM.card0-DP-1:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-DP-2:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-VGA-1:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-eDP-1:
 enabled: enabled
 dpms: On
 status: connected
 edid-base64: AP///////wAw5FcCAAAAAAATAQSVHhN4AteFk1lUjCkiUFQAAAABAQEBAQEBAQEBAQEBAQEByiGggFCEFDAwIDYAML4QAAAacBegwFCEFDAwIDYAML4QAAAaAAAA/gA4NzVWS4AxNDFXUDIKAAAAAAAAQTEhAAAAAAkBCiAgAJk=
 modes: 1440x900 1440x900 1152x864 1024x768 800x600 640x480 720x400 640x400 640x350
Date: Fri Jan 26 22:03:31 2018
Desktop-Session:
 'mate'
 '/etc/xdg/xdg-mate:/etc/xdg/xdg-mate:/etc/xdg'
 '/usr/share/mate:/usr/share/mate:/usr/share/mate:/usr/local/share/:/usr/share/'
DetectedPlugins:

Env:
 'None'
 'None'
InstalledPlugins:

Load-Avg-1min: 1.43
Load-Processes-Running-Percent: 0.4%
MachineType: Dell Inc. Latitude E6410
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.14.0-15-generic root=UUID=7b8582e8-53d0-403a-867c-dbf27fdd5877 ro quiet swapaccount=1
SourcePackage: chromium-browser
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/28/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A03
dmi.board.name: 0K2MDD
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA03:bd05/28/2010:svnDellInc.:pnLatitudeE6410:pvr0001:rvnDellInc.:rn0K2MDD:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6410
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.
modified.conffile..etc.chromium-browser.default: [modified]
modified.conffile..etc.default.chromium-browser: [deleted]
mtime.conffile..etc.chromium-browser.default: 2018-01-05T21:38:59.630569

[Wei Tsui (ghostplant)]

In addition, the issue still happens when upgrading chromium to 64.0.3282.119-0ubuntu1

[Olivier Tilloy (osomon)]

Would you mind grabbing a screencast of the issue? I'm not familiar with pinyin input, and I'm not sure I'm setting it up correctly, nor do I know what I should be observing… Thanks!

[Wei Tsui (ghostplant)]

I sequentially type "buwei", but 'i' is loss outside the chromium inputbox.

Note that this loss issue doesn't occur in any other gtk3/qt application when typing data to their inputbox.
Beside, when I type characters into Chromium address/searching bar (also a single-line inputbox), the loss also not happen.

So I guest when chromium decorate html inputbox, and when the inputbox has position changes/style changes/etc, there might be a wrong signal from chromium to input method that makes some charactors loss outside the input method table.

See image attached.

[Olivier Tilloy (osomon)]

Can you check whether chrome (as downloaded from https://www.google.com/chrome/browser/desktop/index.html) is also affected?
If so, would you mind filing a bug upstream at https://crbug.com and link it here?
Thanks!

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.