298048 - vertical scroll bar improperly formed (down arrow missing)

Status: RESOLVED WORKSFORME

(Firefox :: General, defect)

Description

[pat hayes]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.8) Gecko/20050511 Firefox/1.0.4
Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.8) Gecko/20050511 Firefox/1.0.4

I am not sure how to classify this, sorry if I get it wrong

The firefox window has a scroll bar on the RHS which (as is normal in such apps)
has a moveable inner bar which can be dragged with the mouse, and should have
two buttons with up and down arrows (as for example this little box does). 
Firefox only displays the up-arrow button. This bug has been in Firefox since
version 1.0. 
My Mac desktop is configured to show both buttons at the bottom of the scroll
bar. Changing the system preferences to display arrows at top and bottom of
windows moves the button to the top but does not prduce a down button. 

If I follow my usual habit, which is to use the mouse instead, and 'hold' the
moveable bar by clicking on it without release, moving the mouse to scroll the
window - in effect, using the mouse like a scroll wheel - then as long as I have
the mouse button depressed, the Firefox (as reported by Activity Monitor) is
using ~97% of my CPU cycles. This is perhaps not exactly a bug, but it is highly
aberrant behavior. Running on my laptop, it quickly causes the entire computer
to become too hot to comfortably hold and the fan to switch on, which is highly
disruptive to nomal use. No other Mac app I have used behaves in a similar way.

This happens while running on OS X v.10.4 both on a G4 powerbok and on a
dual-processor G3 desktop. The same behavior was observed with older versions of
Firefox and with previous versions of OS X. When running on the dual-processor
G3, both processors appear to be affected in the same way.

Reproducible: Always

Steps to Reproduce:
1.Open a Firefox window displaying text larger than the window
2.Place the mouse over the scroll insert in the side-bar, and press the mouse button
3.Keep the mouse button depressed until the Powerbook burns your leg. 



Expected Results:  
1. The sidebar should display the scroll up and down buttons correctly
2. Holding the mouse in any position anywhere in the application window should
not  hog over 90% of the system cycles, under any circumstances.

Comment 1

[zug_treno]

Could these issues be related to, or a duplicate of, bug 215362 and (bug 293962
->) Core bug 141710?

Comment 2

[Mark Mentovai]

Two separate issues.  One issue per bug, please.  Let's make this one about the
missing scroll button.  Summary...adjusted!

If the status bar is hidden, it sounds like bug 56488 - in that case, the
workaround is to turn the status bar on (View:Status Bar) and dupe this bug to
56488.

(P.S. The CPU spike while scrolling is certainly a dupe, the bug number of which
I don't have on hand at the moment.  It's at least partially fixed by bug 298048.)

(P.P.S. What you're calling the "move bar" usually goes by "thumb" or "indicator.")

Comment 3

[Al]

I'm running Mac OS X V 10.3.9 on a PowerPC G4 i-book and just downloaded Firefox (2-6-06). I find that the down arrow appears when I grab the corner and resize the window so that the bottom scroll bar is activated. The down arrow then disappears when the horizontal scroll bar disappears. Always repeatable. 

Comment 4

[Jake Olefsky]

Works for me in 2.0RC2.  If you still have this bug with a more recent version of FF, please reopen this bug and upload a screenshot of the missing scrollbar.