[TagQuery] Improve description search

These all works:
* description:test
* description:"multiple words followed by each other"
* description:"multiple words followed by each oth*"

app/logical/elastic_post_query_builder.rb

@@ -185,8 +185,8 @@ class ElasticPostQueryBuilder
     add_array_relation(:rating, :rating)
     add_array_relation(:filetype, :file_ext)
     add_array_relation(:delreason, :del_reason, action: :wildcard)
-    add_array_relation(:description, :description, action: :match)
-    add_array_relation(:note, :notes, action: :match)
+    add_array_relation(:description, :description, action: :match_phrase_prefix)
+    add_array_relation(:note, :notes, action: :match_phrase_prefix)
     add_array_relation(:sources, :source, any_none_key: :source, action: :wildcard)
     add_array_relation(:deleter, :deleter)
     add_array_relation(:upvote, :upvotes)

app/logical/tag_query.rb

@@ -60,7 +60,7 @@ class TagQuery
   end
 
   def self.normalize(query)
-    tags = TagQuery.scan(query.to_s)
+    tags = TagQuery.scan(query)
     tags = tags.map { |t| Tag.normalize_name(t) }
     tags = TagAlias.to_aliased(tags)
     tags.sort.uniq.join(" ")
@@ -68,8 +68,12 @@ class TagQuery
 
   def self.scan(query)
     tagstr = query.to_s.unicode_normalize(:nfc).strip
-    list = tagstr.scan(/-?source:".*?"/) || []
-    list + tagstr.gsub(/-?source:".*?"/, "").scan(/[^[:space:]]+/).uniq
+    quote_delimited = []
+    tagstr = tagstr.gsub(/[-~]?\w*?:".*?"/) do |match|
+      quote_delimited << match
+      ""
+    end
+    quote_delimited + tagstr.split.uniq
   end
 
   def self.has_metatag?(tags, *)
@@ -99,6 +103,9 @@ class TagQuery
         next
       end
 
+      # Remove quotes from description:"abc def"
+      g2 = g2.delete_prefix('"').delete_suffix('"')
+
       type = metatag_name.start_with?("-") ? :must_not : :must
       case metatag_name.downcase
       when "user", "-user"
@@ -226,8 +233,7 @@ class TagQuery
 
       when "source", "-source"
         add_to_query(type, :sources, any_none_key: :source, value: g2, wildcard: true) do
-          src = g2.gsub(/\A"(.*)"\Z/, '\1')
-          "#{src}*"
+          "#{g2}*"
         end
 
       when "date", "-date"

test/unit/tag_query_test.rb

@@ -4,6 +4,7 @@ class TagQueryTest < ActiveSupport::TestCase
   should "scan a query" do
     assert_equal(%w[aaa bbb], TagQuery.scan("aaa bbb"))
     assert_equal(%w[~AAa -BBB* -bbb*], TagQuery.scan("~AAa -BBB* -bbb*"))
+    assert_equal(['test:"with spaces"', "aaa", "def"], TagQuery.scan('aaa test:"with spaces" def'))
   end
 
   should "not strip out valid characters when scanning" do