561605 - ZWJ doesn't affect Syriac letters

Status: UNCONFIRMED

(Core :: Layout: Text and Fonts, defect)

Description

[tsdodo]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 (.NET CLR 3.5.30729)

Zero-width joiner does not change adjacent Syriac letters to connected form.

Reproducible: Always

Comment 1

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Do you have a URL or a testcase that you can upload (see "Add an attachment" on this bug report) showing the problem?

This might be a duplicate of bug 484117.

Comment 2

[tsdodo]

Attachment: ZWJ and syriac nun test

Comment 3

[tsdodo]

This bug is indeed related to 484117:

I just tested by changing the direction to RTL on my attached file and row 2 worked as expected, but row 1 still did not show a final-connected-nun. Am I right in saying that this behavior regarding row 1 is incorrect?

Comment 4

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

I'd expect row 1 to show the final form and row 2 to show the initial form.  I can't say I'd know what those ought to look like, though.  (Row 3 should show initial then final, and be indistinguishable from without the ‍.)

Comment 5

[Simon Montagu :smontagu]

For me row 1 is showing the isolated form, not the final form. I see the same thing in IE, so this may well be a bug in Uniscribe.

Comment 6

[tsdodo]

Attachment: Updated testcase

This testcase shows better tests and describes each row
The last row shows the effects of ZWJ in between 2 Syriac letters

Comment 7

[tsdodo]

Attachment: Updated testcase

This testcase shows better tests and describes each row
The last row shows the effects of ZWJ in between 2 Syriac letters

Sorry...I didn't realize I shouldn't have checked patch :/

Comment 8

[tsdodo]

Attachment: Testcase showing all possibilities including rtl

Comment 9

[Behdad Esfahbod]

This is because the ZWJ is being rendered with a font earlier in the fallback chain.