Scrolling of more than asked number of pixels

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Bind scroll down to space, up with Backspace
2. Put 150 pixels in the config
3. Scroll down with space twice
4. Scroll up with backspace

What is the expected output?
To be at the same level in the page

What do you see instead?
I'm placed much lower in the page, like if scrolling down was of one true
screen page, while scrolling up was of only 150 pixels (as asked).

What version of the product are you using? On what operating system?
0.5.2 on Ubuntu 8.04

Please provide any additional information below.
BTW, isn't it possible to avoid having to specify a number of pixels, and
just make a scroll of the visible screen height?

Client Configuration (automaitcally added by MLB)
OS: Linux, Firefox 3.0.3, MLB 0.5.2
MLB Configuration:
mouselessbrowsing.toggleExlNumpadWithDoubleStrokeNumKey: true
mouselessbrowsing.enableOtherIds: true
mouselessbrowsing.keys.blurActiveElement: 432
mouselessbrowsing.siteRules: <listbox
xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
id="siteRulesLB" prefid="mouselessbrowsing.siteRules" flex="1"
disabled="false"><listhead><listheader label="URL Pattern"/><listheader
align="center" style="display: none;"/><listheader style="display:
none;"/><listheader style="display: none;"/></listhead><listcols><listcol
flex="1"/><listcol style="display: none;"/><listcol style="display:
none;"/><listcol style="display: none;"/></listcols></listbox>
mouselessbrowsing.disableAllIds: false
mouselessbrowsing.keys.scrollUp: 128
mouselessbrowsing.disableMLB: false
mouselessbrowsing.executeAutomaticNew: false
mouselessbrowsing.enableImgLinkIds: true
mouselessbrowsing.idChars: 
mouselessbrowsing.keys.toggleAllIds: 1762
mouselessbrowsing.keys.openInCoolirisPreviewsPostfixKey: 1696
mouselessbrowsing.idType: NUMERIC
mouselessbrowsing.keys.openInNewWindowPostfixKey: 1776
mouselessbrowsing.filterDuplicateLinks: true
mouselessbrowsing.showTabIds: true
mouselessbrowsing.keys.toggleExlusiveUseOfNumpad: 304
mouselessbrowsing.disableAutomaticPageUpdateOnChange: false
mouselessbrowsing.autoExecuteDelay: 1500
mouselessbrowsing.keys.selectLink: 260
mouselessbrowsing.showIdsOnDemand: false
mouselessbrowsing.version: 0.5.2
mouselessbrowsing.exclusiveNumpad: false
mouselessbrowsing.keys.toggleMLB: 1760
mouselessbrowsing.executeAutomatic: true
mouselessbrowsing.modifierForWritableElement: 2
mouselessbrowsing.pixelsToScroll: 150
mouselessbrowsing.showMlbIconInStatusbar: true
mouselessbrowsing.keys.blockKeyboardInputForMlb: 432
mouselessbrowsing.keys.toggleEnableDisableMLB: 1761
mouselessbrowsing.keys.clearKeybuffer: 432
mouselessbrowsing.maxIdNumber: 1000
mouselessbrowsing.showKeybufferInStatusbar: true
mouselessbrowsing.keys.addSiteRule: 1319
mouselessbrowsing.keys.scrollDown: 512
mouselessbrowsing.keys.openConfig: 1958
mouselessbrowsing.executeInstantlyWhenIdUnique: false
mouselessbrowsing.keys.historyBack: 1060
mouselessbrowsing.smartPositioning: true
mouselessbrowsing.modifierForOpenInNewTab: 1
mouselessbrowsing.modifierForOpenInNewWindow: 3
mouselessbrowsing.initOnDomContentLoaded: true
mouselessbrowsing.modifierForOpenInCoolirisPreviews: -1
mouselessbrowsing.styleForFrameIdSpan: position:absolute; top:0; left:0;
font-size:xx-small;line-height:130%;;
border-color:black; border-width:1px; border-style:solid;
-moz-border-radius:2px;
padding:0px 2px 0px 2px;
z-index:500;
background-color:#D6E3FE;
mouselessbrowsing.styleForIdSpan: font-family:arial, sans-serif;
font-size:xx-small; line-height:130%;
border-width:1px; border-style:solid;-moz-border-radius:2px;
padding:0px 2px 0px 2px;
vertical-align:center;
margin-left:2px; margin-right:1px;
max-width:20px; max-height:10px;
overflow:visible;float:none;
mouselessbrowsing.enableLinkIds: true
mouselessbrowsing.debug: false
mouselessbrowsing.keys.updatePage: 1713
mouselessbrowsing.showMlbMenu: true
mouselessbrowsing.debug.perf: false
mouselessbrowsing.enableFormElementIds: true
mouselessbrowsing.enableFrameIds: true
mouselessbrowsing.keys.historyForward: 1124
mouselessbrowsing.keys.openInNewTabPostfixKey: 1712

Original issue reported on code.google.com by fabrice....@gmail.com on 1 Apr 2009 at 11:37