446682 - Textarea doesn't invalidate final line when I insert a newline, on this testcase

Status: NEW

(Core :: Web Painting, defect)

Description

[Daniel Holbert [:dholbert]]

STEPS TO REPRODUCE:
1. Load the URL (requires login for wiki.mozilla.org)
   --> Should show "Editing QA/Firefox3.1/TestPlan" with a big textarea
2. Press Ctrl-F
3. Type "acid"
   --> Now "|ACID 3" is at the bottom of the textarea, with "|-" above it
4. Press 'Esc' to cancel find
5. Pres 'uparrow' twice, and then press 'end'
6. Press 'Enter'

SHORTER STEPS TO REPEAT EXPERIMENT: (if you've just done steps-to-reproduce)
 a) Ctrl-Shift-R. (Full reload; flushes any changes to textarea contents)
 b) Ctrl-G (to repeat find jump to 'ACID3')
 c) Then perform steps 5-6 from original steps-to-reproduce.

EXPECTED RESULTS:
 The added newline should push "|-" down one line, and push "|ACID 3" out of view.

ACTUAL RESULTS:
* "|-" disappears
* "|ACID 3" stays visible in the same spot
* When I do any of the following, the display updates to match EXPECTED RESULTS:
  - Change hover status (move mouse over / away from of the textarea)
  - Click in the textbox
  - Tab to another field
  - Alt-Tab to another window

Tested using FF3.0.1 / Ubuntu.  (Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.1) Gecko/2008070206 Firefox/3.0.1)

Comment 1

[Daniel Holbert [:dholbert]]

Attachment: testcase 1

Here's a partly-minimized testcase that reproduces the bug for me.

Comment 2

[Daniel Holbert [:dholbert]]

NOTE: It seems the bug can only be reproduced once per pageload.  (Subsequent edits after step 6 from steps-to-reproduce don't seem to trigger the bug for me)

ANOTHER NOTE: When I try to reproduce the bug using testcase 1, I occasionally get expected behavior.  If I follow up with "SHORTER STEPS TO REPEAT EXPERIMENT", though, I think I always get the bug.