373054 - [pango] missing characters invisibly dropped

Status: RESOLVED DUPLICATE of bug 372629

(Core :: Graphics, defect)

Description

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

Attachment: testcase

Under GTK, missing characters (unavailable with the font) are typically rendered as a box with the hexidecimal Unicode digits of the character inside the box in a very small font.

For a while, under Thebes, we left space for these missing character markers, but didn't draw them.  Now (as of one of roc's text run landings, I think, but not the most recent one) we've switched to not even leaving space for the missing characters.

Steps to reproduce:
 1. load attached testcase
 2. look at the ends of the two lines

Actual results:  Both lines end with "xx".

Expected results:  The lines should each end with x, a missing character marker, and and x, where the missing character marker is a square with hexidecimal digits inside it (see screenshot of Firefox 2).

Comment 1

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

Attachment: expected results (screenshot of Firefox 2)

Comment 2

[Phil Ringnalda (:philor)]

Bug 372629, no?

Comment 3

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

I'm not sure if that'll cause us to draw the correct missing glyphs for each platform, though.

Comment 4

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

(But yes, may well be a duplicate.  I didn't see that, since I searched for character instead of glyph.)

Comment 5

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

Maybe a cross-platform thing is ok, too.  Not sure exactly what roc's doing, but anyway: