Issue 129119 in chromium: Chrome OS: The position of the IME candidate window changes too often

[chro...@googlecode.com]

Status: Available
Owner: ----
CC: h...@chromium.org, n...@chromium.org, koma...@chromium.org
Labels: Type-Bug Pri-2 Area-UI Feature-TextInput OS-Chrome Mstone-21

New issue 129119 by yus...@chromium.org: Chrome OS: The position of the
IME candidate window changes too often
http://code.google.com/p/chromium/issues/detail?id=129119

Version: r138071 (m21)

What steps will reproduce the problem?

1. visit textarea.org
2. move the cursor near the bottom of the screen
3. enable Japanese IME (set the number of maximum suggestion to 9, if you
haven't)
4. type ぐーぐる
5. the suggestion window for the preedit "ぐーぐる" is shown *above* the
cursor. (# of candidates = 9)
6. type く
7. the suggestion window for the preedit "ぐーぐるく" is shown *below* the
cursor. (# of candidates = 3)
8. type ろーむ space space
9. the conversion window for the preedit "ぐーぐるくろーむ" is shown
*above* the cursor. (# of candidates = 9)

What is the expected output? What do you see instead?

actual: the position of the window changes way too often.

I chatted with komatsu@ about the preferred behavior and we agreed that we
should not show the window below the cursor once it's shown above the
cursor.

In the example above, the window should be shown above the cursor in step
#7.

Please use labels and text to provide additional information.

I know that Mozc for Win/Mac has the same issue (and users of the IMEs seem
to be fine with the current behavior), but I believe the issue is more
severe on a Chromebook where the resolution of the screen is relatively low
and the user tends to use the bottom part of the screen more often.

[chro...@googlecode.com]

Comment #1 on issue 129119 by yus...@chromium.org: Chrome OS: The position

of the IME candidate window changes too often
http://code.google.com/p/chromium/issues/detail?id=129119

(No comment was entered for this change.)

Attachments:
IMG_20120522_135305.jpg 364 KB
IMG_20120522_135319.jpg 219 KB
IMG_20120522_135343.jpg 477 KB

[chro...@googlecode.com]

Updates:
Status: Assigned
Owner: n...@chromium.org

Comment #2 on issue 129119 by n...@chromium.org: Chrome OS: The position of

the IME candidate window changes too often
http://code.google.com/p/chromium/issues/detail?id=129119

I'll take this issue.

[chro...@googlecode.com]

Comment #3 on issue 129119 by yus...@chromium.org: Chrome OS: The position

of the IME candidate window changes too often
http://code.google.com/p/chromium/issues/detail?id=129119

> we should not show the window below the cursor once it's shown above the
> cursor

within one IME session, I mean. something like this:

on_start_composition() {
preferred_pos = bottom;
}

on_update_window() {
if (preferred_pos == top) {
if (UNLIKELY(overflow))
preferred_pos = bottom;
} else {
if (overflow)
preferred_pos = top;
}

// if on_start_composition() is not available:
on_commit() {
preferred_pos = bottom;
}
on_cancel() {
preferred_pos = bottom;
}

[chro...@googlecode.com]

Updates:
Status: Started

Comment #4 on issue 129119 by n...@chromium.org: Chrome OS: The position of

the IME candidate window changes too often
http://code.google.com/p/chromium/issues/detail?id=129119

[chro...@googlecode.com]

Comment #5 on issue 129119 by bugdro...@chromium.org: Chrome OS: The

position of the IME candidate window changes too often

http://code.google.com/p/chromium/issues/detail?id=129119#c5

The following revision refers to this bug:
http://src.chromium.org/viewvc/chrome?view=rev&revision=141196

------------------------------------------------------------------------
r141196 | no...@chromium.org | Fri Jun 08 04:28:47 PDT 2012

Changed paths:
M
http://src.chromium.org/viewvc/chrome/trunk/src/chrome/browser/chromeos/input_method/candidate_window_view.h?r1=141196&r2=141195&pathrev=141196
M
http://src.chromium.org/viewvc/chrome/trunk/src/chrome/browser/chromeos/input_method/candidate_window.cc?r1=141196&r2=141195&pathrev=141196

Reduce candidate window flickering.

Candidate window is shown upper side of composition string if there is no
space to be shown.
However it become too often.
According to CL, candidate window can be switched the side to be shown only
one time.


BUG=129119
TEST=manually done on Alex

Review URL: https://chromiumcodereview.appspot.com/10542051
------------------------------------------------------------------------

[chro...@googlecode.com]

Updates:
Status: Fixed

Comment #6 on issue 129119 by n...@chromium.org: Chrome OS: The position of

the IME candidate window changes too often

[chro...@googlecode.com]

Updates:
Status: Verified

Comment #7 on issue 129119 by bhaves...@chromium.org: Chrome OS: The