Bug 159821 – REGRESSION(r203266): This change caused editing/deleting/delete-emoji.html to time out on El Capitan, crash under GuardMalloc (Requested by ryanhaddad on #webkit).

• Component: New Bugs
• Status: RESOLVED FIXED

[WebKit Commit Bot]

http://trac.webkit.org/changeset/203266 broke the build:
This change caused editing/deleting/delete-emoji.html to time out on El Capitan, crash under GuardMalloc (Requested by ryanhaddad on #webkit).

This is an automatic bug report generated by webkitbot. If this bug
report was created because of a flaky test, please file a bug for the flaky
test (if we don't already have one on file) and dup this bug against that bug
so that we can track how often these flaky tests fail.

[WebKit Commit Bot]

Created attachment 283773 [details]
ROLLOUT of r203266

Any committer can land this patch automatically by marking it commit-queue+.  The commit-queue will build and test the patch before landing to ensure that the rollout will be successful.  This process takes approximately 15 minutes.

If you would like to land the rollout faster, you can use the following command:

  webkit-patch land-attachment ATTACHMENT_ID

where ATTACHMENT_ID is the ID of this attachment.

[Ryan Haddad]

Rolled out in <http://trac.webkit.org/changeset/203287>

[Myles C. Maxfield]

Caused by <rdar://problem/27380532>

[Myles C. Maxfield]

Inside findNextWordFromIndex in TextBoundaries.mm:

    // Hack around <rdar://problem/27380532>
    if (!text.is8Bit()) {
        unsigned newLength = std::min(text.length(), 256U);
        unsigned toRemove = text.length() - newLength;
        text = StringView(text.characters16() + toRemove, newLength);
        position -= toRemove;
    }