[Webkit-unassigned] [Bug 119320] New: Do not normalize into NFC the values of form fields

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=119320

           Summary: Do not normalize into NFC the values of form fields
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Forms
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: ap at webkit.org, jonlee at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/c167d111dd8a44da334d74e4b6608811b465945d

This commit renames the TextEncoding::encode(const String&, UnencodableHandling) const
API function to normalizeAndEncode() to make clear that the function
first applies Unicode NFC normalization before encoding the string. All
existing references to encode() except for one were updated to call
normalizeAndEncode() instead.

TextEncoding::encode(const String&, UnencodableHandling) const is added
back as a new API function which only encodes the string, but does not
normalize the string before encoding.

The one call to the old encode() function that was not updated is in
FormDataList::appendString(const String&). This was left as a call to
the new encode() to fix Issue 117128.

Chrome and Safari are unlike other browsers in that they apply Unicode
NFC normalization to form values when submitting a form; in particular,
the following browsers were tested and found not to normalize the form
values:
- Firefox 22.0
- Firefox ESR 17.0.7
- Opera 12.16
- IE 6
- IE 7
- IE 8
- IE 9
- IE 10
- Amaya 11.4.7

NFC normalization actually changes the meaning of text in certain scripts.
Notably, there are certain Biblical Hebrew words for which normalization
causes the word to be erroneously encoded. One example is given on page 9
of the SBL Hebrew Font User Manual version 1.5:
http://www.sbl-site.org/Fonts/SBLHebrewManualv1.5.pdf
This example is added as the new form-data-encoding-3.html layout test.

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