When i put a bullet list in a document, if i press tab button before press any other key and then i press the backspace key, the cursor leaves the margin of the document. I recorded a video showing this, you can see here.
My version of LibreOffice is the 3.4.3 in Debian GNU/Linux and i tested with similar results in a OOo 3.2 in Ubuntu 10.04.
Sorry for my english, but im from Argentina.
The behavior is reproducible on LibreOffice 3.4.4RC1
[Reproducible] with "LibreOffice 220.127.116.11 German UI/Locale [Build-ID: dc9775d-05ecbee-0851ad3-1586698-727bf66] on German WIN7 Home Premium (64bit).
Same with OOo 3.1.1, 3.3 and 3.4Beta, so I believe it's inherited from OOo (worked fine with OOo 1.1.4).
I see here 2 Problems:
a) Backspace imitates the function of <shift+tab> (what is the key for some kind of UNDO of increasing the indent by the leading TAB
b) <shift+tab> also moves the caret out of the sheet proceeding as per report but using it instead of <backspace>
I have no idea concerning intended behavior, but the observed one , will ask.
Created attachment 58585 [details]
Screenshot shows caret out of sheet area
to my opinion the problem begins already with the tab. If you try to insert it directly after the bullet not a tab is inserted but the indentation is increased. And if you press the backspace button afterwards the indentation is decreased. To my opinion both, Tab and BS, should not influence the indentation.
During reproducing this bug I found some more possibilities to move the cursor beyond the paper margins (always with paragraph aligned left):
 Just click "Decrease Indent" some times.
 Left paper margin: Format > Paragraph... > Indents & Spacing > Indent > Before text > Input higher negativ value
 Right paper margin: Format > Paragraph... > Indents & Spacing > Indent > After text > Input higher negativ value, insert characters up to the right paper margin
Observed with LO versions 3.4.5 and 3.5.0 with Win XP
Bug still exists in Versions 3.6.4 and 4.0 beta2
See also bug 41469.
Bjoern Michaelsen committed a patch related to this issue.
It has been pushed to "master":
fdo#42708: bullets should not exit stage left ...
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.
Fixed on master, bullets should now not move left of the border.
The general behavior is indeed awkward, but as intended (see referenced bug). Changing this would be a different UI bug, so if you want to have further changes, please file an new bug about this.