343703 - Left (horizontal-up) scrollbutton does not signal disabled state to browser.

Status: RESOLVED INVALID

(Firefox :: Tabbed Browser, defect)

Description

[Ed Hume]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1a3) Gecko/20060705 BonEcho/2.0a3
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1a3) Gecko/20060705 BonEcho/2.0a3

Although the default theme shows a disabled state in its icon when the row of scrollable tabs reaches the far left end, the disabled condition is not passed to where a third-party theme can make use of it.

When one uses DOMi to inspect the scrollbuttons when they are in a disabled state, the right scrollbutton shows disabled=true when one inspects it in a new window. However, when the left scrollbutton is inspected in a new window while it is in a disabled state, the disabled condition is not displayed.

Although the default theme shows a disabled left arrow, when the left scrollbutton is inspected in a new window, no disabled state is present.

Reproducible: Always

Steps to Reproduce:
1. Build a third-party theme with the current default scrollbox.css file
2. Install it in Firefox.
3. With Firefox open, make enough tabs to require scrollbuttons.

Actual Results:  
The left scrollbutton does not show a disabled state.
The right scrollbutton does show a disabled state.

Expected Results:  
Both scrollbuttons should show a disabled state.

When scrollbox.css is transplanted unchanged from the default theme to a third party theme the disabled state does not appear.

Even though the left and right codes are identical except for filenames, the right scrollbutton shows a disabled state where the left scrollbutton does not.

The visual appearance is reflected in the code apparent in DOMi.

Comment 1

[Ed Hume]

This problem turned out to be a margin issue: giving tab {} a left margin of 1px produced the results noted above.

This is an invalid bug.