429905 - Scroll-bar behaviour in Camino 2 weird and buggy when I click on slider

Status: RESOLVED DUPLICATE of bug 429020

(Camino Graveyard :: General, defect)

Description

[Peter Dyballa]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-US) AppleWebKit/523 (KHTML, like Gecko, Safari/523.10) OmniWeb/v621.0.99313
Build Identifier: Version 2.0a1pre (1.9pre 2008041400)

When I click somewhere into the slider, the slider tries to position
itself in a way that the mouse cursor is in its middle. This slider movement
causes a movement of the viewport, i.e., the view of the page is now a
different one.

When I now try to drag the slider, the viewport returns in a jump or warp
to the original place (for example the start of the page), jumps back to the
position according to the slider's momentary position in the scroll-bar, and then
smoothly follows my drag. But now the cursor is *not* in the slider's middle
but at the spot where I first hit it before the slider positioned itself
symmetrically under the cursor.

Reproducible: Always

Steps to Reproduce:
1. load a page
2. click in the lower part of the scroll-bar
3. keep the button pressed
4. compare the mouse cursor's position with that at click time
5. start to drag with the mouse
6. compare the mouse cursor's position with that before
7. notice how the page moves down and up
Actual Results:  
Too much movement of page and scroll-bar slider

Expected Results:  
No movement of slider when I click on it,
no movement of page's viewport.
The viewport should start to move first when I start to drag on the slider.

It's necessary to keep the mouse button pressed.
If the mouse button is released after the first click, the slider just positions itself symmetrically under the mouse cursor – and the page's viewport follows accordingly.
Upon next click that one happens already in the middle of the slider so no warp of slider and viewport can happen.

PowerBook G4, Mac OS X 10.4.11, German keyboard

Comment 1

[philippe (part-time)]

Just to make sure: do you have 'Click in the scrollbar to: Scroll to here' selected in the system preferences ?

In which case it is a known issue: bug 429020.

Comment 2

[Chris Lawson (gone)]

Yeah, I can reproduce this if and only if that pref is enabled in the Appearance pref pane.

Comment 3

[Peter Dyballa]

Sorry, I cannot determine which preferences are sets. The Help pages are unusable, stretching wider than the window. The light text is unreadable on the dark background. Is the Help really intended to be read?

defaults read org.mozilla.camino does not show anything that could match ...

Comment 4

[Chris Lawson (gone)]

The Appearance pref pane, in System Preferences, is where this preference lives. The pref has nothing to do with Camino at all.

cl

Comment 5

[Peter Dyballa]

Found it! Changing the setting to 'next page' changes Camino's behaviour.

Anyway, the 'Jump to here' setting references clicking into the free and not by the slider obscured area of the scroll-bar, which works fine. So the code needs to check whether the slider is found where I click, to behave correctly.