186891 - Modern: Bookmarks "jump" back to old position after using scrollbar

Status: VERIFIED FIXED

(SeaMonkey :: Themes, defect)

Description

[Oliver Kluge]

User-Agent:       Mozilla/5.0 (OS/2; U; Warp 4.5; en-US; rv:1.2.1) Gecko/20021201
Build Identifier: Mozilla/5.0 (OS/2; U; Warp 4.5; en-US; rv:1.2.1) Gecko/20021201

On Mozilla/5.0 (OS/2; U; Warp 4.5; en-US; rv:1.2.1) Gecko/20021201 I see a
bahaviour that I cannot remember having seen on Mozilla 1.1/OS/2.

If you have a large bookmarks file, and you grab the scrollbar in the
sidebar/bookmarks windows, I can reproduce this:

Pull the scrollbar far down and release it. The contents of the bookmarks window
shift down correctly, but if you continue to move the mouse over the bookmarks
window, occasionally (3 out of 5) the contents jump back up again.

This only happens if immediately following the scrollbar movement you continue
to move the mouse over the bookmarks. Once a couple of seconds have passed, the
bookmarks become immune to the effect.

Also, I have the impression (although I cannot prove this) that the effect is
exaggerated if your mouse pointer is outside the scrollbar when you release the
mouse button after pulling on the scroll bar. And seems to me that the whole
thing only happens when pulling down, not when pulling up.



Reproducible: Sometimes

Steps to Reproduce:
1. Open bookmarks in sidebar
2. pull the scrollbar far down
3. release mouse button and continue to move mouse pointer over bookmarks

Actual Results:  
Bookmark window contents jump back up.

Expected Results:  
Leave bookmarks alone.

Comment 1

[Jo Hermans]

*** Bug 186892 has been marked as a duplicate of this bug. ***

Comment 2

[Oliver Kluge]

This bug is also present on 1.3a. One out of two times bookmarks jump back to
their old position after usage of the scroll bar.

Comment 3

[Oliver Kluge]

I just voted for this bug because nothing seems to happen (three months UNCO).
Now its March 2003, and Mozilla 1.3b still has this bug.

If you have a very large bookmarks file (as I have), you almost cannot go to the
end of it. As soon as you let go of the scrollbar, 4 out of 5 times the
bookmarks list immediately jumps back to the top.

Also, sometimes when you have scrolled to some mid-point in the bookmarks, you
may see the strange behaviour that if you drag something on the desktop (_not_
to and _not_ from Mozilla, but between two unrelated programs) then the
bookmarks jump to the top, but then keep on scrolling downward, unstoppable. The
only way to end this annoying behaviour is to drag the scrollbar all the way
down, which - as written above - mostly results in an immediate jump to the top.

Comment 4

[Oliver Kluge]

I have switched to 1.3 final, and the bug has somewhat changed it's behaviour.

Now the bookmarks only jump back to the top if - after dragging the scrollbar
down and releasing the mouse button - I mouseover the arrow-down-button on the
scrollbar. This is 100% reproducible.

But no one listens to this bug? Three months UNCO? Maybe it's platform specific?

Comment 5

[Oliver Kluge]

Attachment: Bookmarks file that causes the bug to appear

This synthetic bookmarks file contains > 630 unique bogus entries. It is large
enough (> 200 KByte) to reproduce the bug as described.

Comment 6

[Mike Kaply [:mkaply]]

I'm not seeing this behavior.

I dragged the thumb all the way to the bottom, released the mouse button and
then moved the mouse pointer over the down arrow.

I'm using the trunk. I'll check 1.3

Comment 7

[Oliver Kluge]

At some point in the past I believed it could be (another) bug related to
AMOUSE. But no change in AMOUSE's settings would change anything in the bug
behaviour.

I have, however, found that the bug can also be triggered by dragging the thumb up.

I just found out that it does not take a mouseover over the arrow-down-button,
but rather the history tab just underneath it. When testing, I stopped
mouseovering not fast enough to stay inside the arrow-down-button, so I hit the
History tab. And triggered the bug. But when testing the up version, I could
brake fast enough not to hit the Tinderbox tabs. So I did not trigger it there.
Testing can mislead sometimes, apologies for that.

I always believed it had to be the arrow-down-button, because the
arrow-up-button does not provoke the bug. But I just checked, the tabs above
bookmarks (Tinderbox: SeaMonkey-Ports, Search etc.) also provoke this behaviour.

Also, it seems that it is related to a mark inside the bookmarks. Some line
within the bookmarks needs to be highlighted and then the bug is 100%
reproducible, at least here.

Still, I need to check this on Linux.

Comment 8

[Mike Kaply [:mkaply]]

maybe there is another bug causing this?

When you move to far to the left with the mouse button down while moving the
thumb, you go to the top (or bottom) depending on where you started.

Is this what you are seeing?

Comment 9

[Oliver Kluge]

Now this is becoming real strange.

First of all, now I am certain this is OS/2 platform specific, so I set OS:OS/2.
I checked with the Linux port of Mozilla, it does not show the symptoms I
described in this bug and not the symptoms you describe at all.

Strangely, the symptoms you describe (jumping to the top or bottom when going
too far left or right while dragging the thumb) is something I cannot reproduce,
while it seems that you cannot reproduce the symptoms I am seeing.

But I believe that there is a common cause, and may I speculate that it lies in
Chrome. First, there is another bug that describes the annoying jiggling of the
UI when you mouseover the tabs (activated tabs seem to be one pixel higher than
non-activated). This bug previously has been for all OS, now on the Linux
platform it's fixed. Not so on the OS/2 platform.

I am kind of convienced that the jumping occurs when the repaint action caused
by the mouseovers over the tabs causes the scrollbar-thumb-handling method to
discard all changes that have occurred since the thumb was dragged. Maybe going
too far left or right causes the same error. Could the difference between your
and my symptoms be due to different mouse drivers?

Comment 10

[Oliver Kluge]

This annoying bug is still present in 1.4b.

With it, the Bookmarks window is still utterly unusable. Please, please fix this.

Comment 11

[Mike Kaply [:mkaply]]

The jumping of the tabs has been fixed.

We still have never been able to recreate this problem.

Comment 12

[Oliver Kluge]

Well, here it is, and it makes bookmarks (at least the ones to the end of the
bookmark list) completely unusable.

As I wrote, it was a misreception of me to think that the jumping is being caued
by mouseover of the down arrow in the scroll bar.

Scroll down to the very end of bookmarks by dragging the thumb or by using the
wheel. Now just move the mouse pointer over _any_ tab head. No matter whether it
is "History" or "What's related".

They all cause bookmarks to jump back to the old position, whereever you started
when you dragged them down. The jump occurs the very moment that the other tab
head gets focus (is being highlighted). In that moment, the entire UI jiggles
one pixel (that is another reported bug) and the jump occurs.

Comment 13

[Mike Kaply [:mkaply]]

The missing part of the equation was that it only happens with Modern theme.

It happens on Windows as well.

Comment 14

[Oliver Kluge]

Interesting! I haven't tried it on Windows. On Linux I could not reproduce the
effect...

Comment 15

[Mike Kaply [:mkaply]]

It only happens on me for Windows because I get the "jump" with the mouse over
where the font change. I have my Windows font set to extra large for testing.

So you were correct, it has to do with the font change causing the tab to get
bigger.

I thought I had fixed the fact that the tabs jumped like that, but for some
reason it is still happening...

Comment 16

[Mike Kaply [:mkaply]]

This is fixed with:

201598

Comment 17

[Oliver Kluge]

Confirmed. I manually introduced Mike's patch from #201598 into my
bin\chrome\modern.jar, and that patch positively fixes this bug.

That "may" lead to another point, and I'm not sure whether I should create a new
bug (or propose a future improvement): Bookmarks jump back to top when another
tab is activated (like Search) and Bookmarks are re-activated.

For the moment I'll mark this one fixed.

Comment 18

[Grace Bush]

verified