Git extensions when searching using different filters (for example, commit message) will show results with commit messages that don't contain my search string. This is really annoying is there any way to prevent this?
Command line git filtering using --grep shows only the appropriate commits.
That quick filter seems to show commits with containing the string and the trees that depend upon those commits. Going to the git extensions documentation, it seems to do what you want, you have to use the "advanced filter". This is in the context menu that can be reached by right clicking the pane that shows the commit log. See below:
