/b-gtk/fix-viz

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Add options to viz treeview to not show the line graph, and to only show the main line.
Set the revision browser to use these options.

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Lines of Context:
lock.py
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from gi.repository import Gtk
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RESPONSE_BREAK = 0
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RESPONSE_CANCEL = Gtk.ResponseType.CANCEL
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READ = "read"
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WRITE = "write"
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def acquire(branch, lock_type):
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    if branch.get_physical_lock_status():
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        dialog = LockDialog(branch)
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        response = dialog.run()
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        dialog.destroy()
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        if response == RESPONSE_BREAK:
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            branch.break_lock()
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        else:
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            return False
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    if lock_type == READ:
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        branch.lock_read()
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    elif lock_type == WRITE:
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        branch.lock_write()
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    return True
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def release(branch):
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    if branch.get_physical_lock_status():
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        dialog = LockDialog(branch)
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        response = dialog.run()
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        dialog.destroy()
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        if response == RESPONSE_BREAK:
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            branch.break_lock()
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        elif response == RESPONSE_CANCEL:
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            return False
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    branch.unlock()
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    return True
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class LockDialog(Gtk.Dialog):
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    def __init__(self, branch):
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        super(LockDialog, self).__init__()
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        self.branch = branch
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        self.set_title('Lock Not Held')
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        self.get_content_area().add(
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            Gtk.Label(label=(
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                'This operation cannot be completed as '
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                'another application has locked the branch.')))
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        self.add_button('Break Lock', RESPONSE_BREAK)
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        self.add_button(Gtk.STOCK_CANCEL, RESPONSE_CANCEL)
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        self.get_content_area().show_all()