User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; de; rv:1.8.1.2) Gecko/20070312 Firefox/2.0.0.2
Build Identifier: 

If I try to replace a word with search-and-replace, the first occurence of the searched string in the text won't be replaced. Instead of it, it will be extended by the replacement string. For example, if we have this text:

abc def abc def abc

And now I say it should replace "abc" with "xyz" I got this result:

abcxyz def abc def abc

However this bug seems only to occur if I replace word-by-word. If I replace all occurences at once it won't occur. If I replace word-by-word only the first occurence will be extended in a wrong way. After the search reached the end of the text the original part of the extended word is selected for replacing a second time.

(I'm using version 0.2.12 - but this version number is not available on bugzilla)

Reproducible: Always

Steps to Reproduce:
1. Replace some words in a text (deactivate "Replace all")
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