Fixing bug when `ListenableEditingState` is provided `initialState` with a valid composing range, `android.view.inputmethod.BaseInputConnection.setComposingRegion(int, int)` has NPE #30916

fzyzcjy · 2022-01-19T00:10:48Z

Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.
See flutter/flutter#96570

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Fix flutter/flutter#96570

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flutter-dashboard · 2022-01-19T00:10:50Z

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flutter-dashboard · 2022-01-19T00:10:52Z

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flutter-dashboard · 2022-01-19T00:10:52Z

It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie on the #hackers channel in Chat.

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

fzyzcjy · 2022-01-19T00:42:51Z

Well cannot understand that CI error... Have searched keyword ListenableEditingState but no related things. The log seems also unrelated to my code change... Could anyone plz give some hints?

Possibly related @chinmaygarde @darshankawar

jason-simmons · 2022-01-19T01:13:49Z

The "Linux Unopt" CI error is asking for a change to the code formatting
(see https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8824653695614065553/+/u/test:_format_and_dart_test/stdout)

The "build_and_test_linux_unopt_debug" CI error is a flaky test that has been seen before (see flutter/flutter#95751)

fzyzcjy · 2022-01-19T01:23:05Z

@jason-simmons thanks! done

LongCatIsLooong · 2022-01-19T02:09:27Z

shell/platform/android/io/flutter/plugin/editing/ListenableEditingState.java

@@ -141,7 +141,11 @@ public void setComposingRange(int composingStart, int composingEnd) {
    if (composingStart < 0 || composingStart >= composingEnd) {
      BaseInputConnection.removeComposingSpans(this);
    } else {
-      mDummyConnection.setComposingRegion(composingStart, composingEnd);
+      if (mDummyConnection != null) {


Does it make more sense to move the mDummyConnection initialization to before the setEditingState call in the constructor?

I am not sure. Notice mDummyConnection is init as:

Editable self = this; mDummyConnection = new BaseInputConnection(view, true) { @Override public Editable getEditable() { return self; } };

Where there is a self (indeed this). If we move it at the beginning of constructor, that getEditable can return a not-fully-initialized instance imho

If I recall correctly the dummy connection is a quirk to get access to the BaseInputConnection.setComposingRegion static method:
https://cs.android.com/android/platform/superproject/+/master:frameworks/base/core/java/android/view/inputmethod/BaseInputConnection.java;l=104-128;drc=master?q=BaseInputConnection

Since it's called after the super implementation, and all the dummy connection does is changing the current composing region, it should be fine to return the Editable I think (feel free to add a code comment there).

LongCatIsLooong

LGTM. Thanks for fixing this!

fzyzcjy · 2022-01-20T00:27:11Z

You are welcome!

…State` with a valid composing range, `android.view.inputmethod.BaseInputConnection.setComposingRegion(int, int)` has NPE (flutter/engine#30916)

kobi666 · 2022-01-21T00:22:43Z

@chinmaygarde
yo,
so when can we expect this fix to reach stable?

is there an HF version?

FabioPaganoAPSystem · 2022-02-03T23:58:28Z

In flutter version "2.10.0-stable" the bug seems not resolved, I've tested with my app.

everskies · 2022-03-28T18:10:32Z

Would be great if this could be merged into stable! This is our most occurring issue at the moment

fzyzcjy · 2022-03-28T23:55:30Z

Given my understanding of flutter, seems that we need to wait until next stable (which is roughly 2 months later, unfortunately) if it is not in 2.10. Or, we may make a cherry-pick request

apoleo88 · 2022-05-24T10:43:33Z

Still get the error with:

Flutter 2.10.4 • channel stable 
Tools • Dart 2.16.2 • DevTools 2.9.2

Specifically when I double-tap to select the text in a text field.

gonzalonm · 2022-08-05T09:49:49Z

Looks like this fix has not been included in stable channel yet. Does anybody know where it was included?

fzyzcjy · 2022-08-05T10:23:34Z

@gonzalonm May I know where you see it not in stable? from the release date it should have been stable

gonzalonm · 2022-08-05T13:49:40Z

I didn't see it in the release notes. Anyways, I could not reproduce the issue with version 3.0.0, so in that version it has been fixed.
Thanks!

fzyzcjy · 2022-08-05T13:51:01Z

It may be in release notes of engine, while flutter/flutter repo (not flutter/engine) will not say this

Update ListenableEditingState.java

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flutter-dashboard bot changed the base branch from master to main January 19, 2022 00:10

flutter-dashboard bot added the platform-android label Jan 19, 2022

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fzyzcjy mentioned this pull request Jan 19, 2022

When ListenableEditingState is provided initialState with a valid composing range, android.view.inputmethod.BaseInputConnection.setComposingRegion(int, int) has NPE flutter/flutter#96570

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Update ListenableEditingStateTest.java

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LongCatIsLooong reviewed Jan 19, 2022

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LongCatIsLooong requested a review from blasten January 19, 2022 19:02

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chinmaygarde added the waiting for tree to go green This PR is approved and tested, but waiting for the tree to be green to land. label Jan 20, 2022

fluttergithubbot merged commit d405b2b into flutter:main Jan 20, 2022

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Roll Engine from 84e48990dc8f to cd65368f9dec (9 revisions) flutter/flutter#96963

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Fixing bug when `ListenableEditingState` is provided `initialState` with a valid composing range, `android.view.inputmethod.BaseInputConnection.setComposingRegion(int, int)` has NPE #30916

Fixing bug when `ListenableEditingState` is provided `initialState` with a valid composing range, `android.view.inputmethod.BaseInputConnection.setComposingRegion(int, int)` has NPE #30916

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Fixing bug when ListenableEditingState is provided initialState with a valid composing range, android.view.inputmethod.BaseInputConnection.setComposingRegion(int, int) has NPE #30916

Fixing bug when ListenableEditingState is provided initialState with a valid composing range, android.view.inputmethod.BaseInputConnection.setComposingRegion(int, int) has NPE #30916

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Fixing bug when `ListenableEditingState` is provided `initialState` with a valid composing range, `android.view.inputmethod.BaseInputConnection.setComposingRegion(int, int)` has NPE #30916

Fixing bug when `ListenableEditingState` is provided `initialState` with a valid composing range, `android.view.inputmethod.BaseInputConnection.setComposingRegion(int, int)` has NPE #30916

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