378935 - [BC]border-collapse column borders not repainted correctly where no cells present

Status: RESOLVED FIXED

(Core :: Layout: Tables, defect)

Description

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

Attachment: tetscase

A border-collapse border on a column is not repainted correctly where there are no cells on either side of the column.

In the testcase, every cell has the contents "X", but rows have different numbers of cells.  There is a border-collapsed border on the columns.

Steps to reproduce:
 1. load attached testcase
 2. scroll slowly down to the table
 3. switch away from the window and back to it

Expected results: A complete border around all three columns after steps (2) and (3).

Actual results: After step (2), the border between the second and third column does not appear in the area around the bottom row (because it isn't painted in the partial repaints).  But it appears in the complete repaint caused by step (3).

Comment 1

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

See also bug 378933 and bug 378937 on similar testcases.

Comment 2

[Bernd]

thats not entirely new: bug 190593 

Comment 3

[Bernd]

Attachment: patch

bc code relies on having multiple dead cell data entries in a row.

Comment 4

[Boris Zbarsky [:bzbarsky]]

Comment on attachment 428787 [details] [diff] [review]
patch

> +    //bc code relies on having multiple dead cell data entries in a row

Space before "bc", please.  And period at the end?

r=bzbarsky with that.

Comment 5

[Bernd]

http://hg.mozilla.org/mozilla-central/rev/db38e530c170