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In r11723 for #13486 the height of "Commits per author" graph is made flexible. This is done by taking a base height for each author (15) and multiplying that with the number of authors.

The current base height value seems to be a bit on the low side which makes the graph pretty difficult to read. I'll add some examples further on.

I tried several values and came to the conclusion that a value of 30¹ is working best for me. What do you think?

Examples
Repo	Base height 15	Base height 30
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Apache httpd

¹ in source:/trunk/app/controllers/repositories_controller.rb@11845#L414:

Index: app/controllers/repositories_controller.rb
===================================================================
--- app/controllers/repositories_controller.rb  (revision 11845)
+++ app/controllers/repositories_controller.rb  (working copy)
@@ -411,7 +411,7 @@
     fields = fields.collect {|c| c.gsub(%r{<.+@.+>}, '') }

     graph = SVG::Graph::BarHorizontal.new(
-      :height => 15 * commits_data.length,
+      :height => 30 * commits_data.length,
       :width => 800,
       :fields => fields,
       :stack => :side,