1797222 - [CTW] Wrong y coordinate reported for text on lines other than the first

Status: RESOLVED FIXED

(Core :: Disability Access APIs, defect)

Description

[James Teh [:Jamie]]

STR:

1. Open this test case:
   data:text/html,<textarea>ab%0acd
2. Get the Accessible for the textarea.
3. Call CharBounds on it with offset 0. Note the coordinates.
4. Call CharBounds on it with offset 3.
   • Expected: Large y coordinate (because offset 3 is on the second line).
   • Actual: The y coordinate is the same as in step 3).

This is not specific to textarea; you can also reproduce it with <pre>. However, if you use a <br>, so you have two separate text nodes, this works as expected:
data:text/html,<pre>ab<br>cd
I'm guessing there's something weird going on with continuations here.

Practical impact: This breaks Windows Text Cursor Indicator in multi line text boxes, which uses these coordinates to draw its cursor.

Comment 1

[Morgan Reschenberg [:morgan]]

Attachment: Bug 1797222: Make char rects relative to their continuation before caching r?Jamie

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/06d6c10bc5d7
Make char rects relative to their continuation before caching r=Jamie

Comment 3

[Marian-Vasile Laza]

https://hg.mozilla.org/mozilla-central/rev/06d6c10bc5d7