Signed-off-by: NRémy Coutable <remy@rymai.me>

Signed-off-by: NRémy Coutable <remy@rymai.me>

Currently trees are sorted in the fashion:
- folders
- files
- submodules
with each section sorted alphabetically

This changes to this system:
- folders and submodules (sorted together)
- files

This concern provides an optimized/simplified version of the "cache_key"
method. This method is about 9 times faster than the default "cache_key"
method.

The produced cache keys _are_ different from the previous ones but this
is worth the performance improvement. To showcase this I set up a
benchmark (using benchmark-ips) that compares FasterCacheKeys#cache_key
with the regular cache_key. The output of this benchmark was:

    Calculating -------------------------------------
               cache_key     4.825k i/100ms
          cache_key_fast    21.723k i/100ms
    -------------------------------------------------
               cache_key     59.422k (± 7.2%) i/s -    299.150k
          cache_key_fast    543.243k (± 9.2%) i/s -      2.694M

    Comparison:
          cache_key_fast:   543243.4 i/s
               cache_key:    59422.0 i/s - 9.14x slower

To see the impact on real code I applied these changes and benchmarked
Issue#referenced_merge_requests. For an issue referencing 10 merge
requests these changes shaved off between 40 and 60 milliseconds.

Hope to avoid CHANGELOG conflicts. Credit myself for the MR.

Add the devise initializer config setting to enable the sending of notification
emails when a user changes their password.

Signed-off-by: NRémy Coutable <remy@rymai.me>

Added to
* new_issue_email
* new_merge_request_email

We never add things `into` projects, we just add them `to` projects. So how about we rename this to `add_users_to_project`.

Rename `projects_ids` to `project_ids` by following the convention of rails.

Signed-off-by: NRémy Coutable <remy@rymai.me>

Magic Variable - Change the name of the variable to assign the local variable for partial, rather than `i` use the `index`.

Don't pass a local variable called `i` to a partial.

When destroying a namespace, the `skip_repo` parameter is supposed
to prevent the repository directory from being destroyed and allow
the namespace after_destroy hook to run. If the namespace fails
to be deleted for some reason, we could be left with repositories
that are deleted with existing projects.

This class does quite a few interesting things so let's instrument it so
we can see how much time is being spent in this class.

By using Rouge::Lexer.find instead of find_fancy() and memoizing the
HTML formatter we can speed up the highlighting process by between 1.7
and 1.8 times (at least when measured using synthetic benchmarks). To
measure this I used the following benchmark:

    require 'benchmark/ips'

    input = ''

    Dir['./app/controllers/**/*.rb'].each do |controller|
      input << <<-EOF
      <pre><code class="ruby">#{File.read(controller).strip}</code></pre>

      EOF
    end

    document = Nokogiri::HTML.fragment(input)
    filter = Banzai::Filter::SyntaxHighlightFilter.new(document)

    puts "Input size: #{(input.bytesize.to_f / 1024).round(2)} KB"

    Benchmark.ips do |bench|
      bench.report 'call' do
        filter.call
      end
    end

This benchmark produces 250 KB of input. Before these changes the timing
output would be as follows:

    Calculating -------------------------------------
                    call     1.000  i/100ms
    -------------------------------------------------
                    call     22.439  (±35.7%) i/s -     93.000

After these changes the output instead is as follows:

Calculating -------------------------------------
                call     1.000  i/100ms
-------------------------------------------------
                call     41.283  (±38.8%) i/s -    148.000

Note that due to the fairly high standard deviation and this being a
synthetic benchmark it's entirely possible the real-world improvements
are smaller.

Move the last secret from .secret to config/secrets.yml, and delete
.secret if it exists.