gitview: Set the default width of graph cell

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

contrib/gitview/gitview

@@ -526,6 +526,9 @@ class GitView:
 		self.treeview.show()
 
 		cell = CellRendererGraph()
+		#  Set the default width to 265
+		#  This make sure that we have nice display with large tag names
+		cell.set_property("width", 265)
 		column = gtk.TreeViewColumn()
 		column.set_resizable(True)
 		column.pack_start(cell, expand=True)