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@@ -148,7 +148,7 @@ module Prawn
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         renderable_data.each do |row|
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           row.each_with_index do |cell,i|
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             length = cell.lines.map { |e| 
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-              @document.font_metrics.string_width(e,@font_size) }.max +
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+              @document.font_metrics.string_width(e,@font_size) }.max.to_f +
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                 2*@horizontal_padding
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             @col_widths[i] = length if length > @col_widths[i]
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           end

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@@ -128,5 +128,13 @@ describe "A table's content" do
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     output.strings.should == headers + data.flatten[0..-3] + headers +
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       data.flatten[-2..-1]
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   end
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+
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+  it "should allow empty fields" do
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+    lambda {
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+      data = [["foo","bar"],["baz",""]]
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+      @pdf = Prawn::Document.new
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+      @pdf.table(data)
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+    }.should_not raise_error
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+  end
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 end