Exceptions in views hard to catch

The diff fixes my issue.

Hopefully this sufficiently illustrates the problem we're having

application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery
  layout 'application'
  
  rescue_from ActionView::TemplateError, :with => :rescue_template_error

  def rescue_template_error(template_error)
    # any exception raised from views will be wrapped in TemplateError
    # so that you have to examine `template_error.original_exception` and
    # then use `rescue_action_without_handler` if exception should propagate 
    render :text => "rescued TemplateError"
  end

  rescue_from ArgumentError, :with => :rescue_argument_error

  def rescue_argument_error(argument_error)
    # this will get called only when raised from controller level
    render :text => "rescued ArgumentError"
  end
end

posts/index.html.erb

<%# will get caught by `rescue_from ActionView::TemplateError` clause  %>
<% raise ArgumentError, "test ArgumentError" %>

posts_controller.rb

class PostsController < ApplicationController
  def index
    # will get caught by `rescue_from ArgumentError, :with => :rescue_argument_error` clause
    raise ArgumentError, "test ArgumentError"
  end
end

José Valim provided feedback on the patch. Will be providing a better patch and test soon.

Attached is modified patch with test.

Here is a workaround for those who are using Rails 2.3. Place in your ApplicationController:

rescue_from ActionView::TemplateError do |exception|
  rescue_action(exception.original_exception)
end