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[Bug 803348] Re: In Firefox, scrolling and then pressing Ctrl causes zoom


This issue is not limited to Firefox or even the control key.  When
scrolling and then coasting in one application and then using alt-tab to
switch to another application, often the coasting continues.

For example, begin scrolling a long web page in Firefox and let it
coast.  While it is still coasting, press alt-tab but don't release the
alt key.  Every time I do this, the highlighted application in the
application switcher 'coasts' right or left (depending on whether I am
coasting up or down) and then slowly stops after a couple of seconds.

Here is another (less reproducible) example.  I began scrolling and
coasting in Terminator, then pressed alt-tab to switch to Image Viewer
(eog) and the picture I had open zoomed out, which is the 'scroll down'
action in Image Viewer.

Perhaps what I am describing is a different bug, but if so, I it seems
closely connected.  The way coasting is done seems fragile.  It might be
that the fix is simply to stop coasting when any key is pressed, or it
might be a lot more complicated than this.

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  In Firefox, scrolling and then pressing Ctrl causes zoom

Status in firefox package in Ubuntu:

Bug description:
  When scrolling a heavy webpage in Firefox tend to lag on my computer
  so that the motion of the page continues after I have stopped giving
  scrolling commands. If I then, before the page has stopped, press Ctrl
  (to Ctrl-Tab switch between tabs, for example) Firefox starts to zoom
  the page (as when you scroll while holding Ctrl). This is unwanted
  behaviour every time for me. I'm using Ubuntu 11.04 with Firefox 5
  (5.0+build1+nobinonly-0ubuntu0.11.04.2). In Ubuntu 10.10, the
  behaviour was the expected, i.e., zooming or scrolling was determined
  based on if you held Ctrl pressed while rolled your scroll wheel, not
  whether Ctrl was pressed during the motion of the page.

  To reproduce:
  1. Open a webpage in Firefox, preferably a large and heavy one.
  2. Make sure your computer is slow enough that the scrolling motion of the page lags appreciably behind the scrolling commands of your mouse wheel.
  3. Stop rolling the wheel and while the page is still scrolling, press Ctrl. This causes Firefox to zoom the page.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: firefox 5.0+build1+nobinonly-0ubuntu0.11.04.2
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic
  Uname: Linux 2.6.38-8-generic i686
  Architecture: i386
  Date: Wed Jun 29 10:10:27 2011
   firefox 5.0+build1+nobinonly-0ubuntu0.11.04.2
   adobe-flashplugin N/A
   icedtea-plugin 1.1~20110420-0ubuntu1.1
   PATH=(custom, user)
  SourcePackage: firefox
  UpgradeStatus: Upgraded to natty on 2011-06-03 (25 days ago)

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