git-gui: Use git web--browser for web browsing
This patch removes git-gui specific webbrowser guessing and instead relies on git web--browser to do the right thing, removing unnecessary code duplication. New function start_browser encapsulates the browser execution, for usage from other parts of code. This will also make git-gui show the documentation menu item even in cases it might not be able to start up a browser, these cases should be however only very rare. Signed-off-by: NPetr Baudis <petr.baudis@novartis.com> Signed-off-by: NShawn O. Pearce <spearce@spearce.org>
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