backend/app/services/post_create_plan.rb

@@ -87,7 +87,7 @@ class PostCreatePlan
     end
     raise Tag::SectionLiteralParseError.new(raw_name, raw_name) if name.include?('[') || name.include?(']')
 
-    [TagName.canonicalise(name).first, category&.to_sym, sections]
+    [resolved_tag_name(name), category&.to_sym, sections]
   end
 
   def build_default_tag_specs direct_tag_specs
@@ -254,4 +254,11 @@ class PostCreatePlan
       end
     end
   end
+
+  def resolved_tag_name name
+    tag_name = TagName.includes(:canonical).find_by(name:)
+    return name if tag_name.nil?
+
+    (tag_name.canonical || tag_name).name
+  end
 end

backend/app/services/post_import_previewer.rb

@@ -126,7 +126,6 @@ class PostImportPreviewer
     validate_basic_data(attributes, validation_errors)
     validate_preview_tags(merged_tags(tag_sources, provenance['tags']),
                           validation_errors,
-                          field_warnings,
                           known_tags)
     validate_parents(attributes['parent_post_ids'], validation_errors, existing_parent_ids)
     attributes.delete('url')
@@ -450,7 +449,7 @@ class PostImportPreviewer
     []
   end
 
-  def validate_preview_tags raw, errors, field_warnings, known_tags
+  def validate_preview_tags raw, errors, known_tags
     names = raw.to_s.split
     return if names.empty?
     if names.any? { _1.downcase.start_with?('nico:') }
@@ -462,11 +461,6 @@ class PostImportPreviewer
     existing = parsed.filter_map { known_tags[_1] }
     deprecated = existing.select(&:deprecated?).map(&:name)
     errors[:tags] = ["廃止済みタグがあります: #{ deprecated.join(' ') }"] if deprecated.present?
-    known = existing.reject(&:deprecated?).map(&:name)
-    new_tags = parsed.uniq - known
-    if new_tags.present?
-      add_field_warning!(field_warnings, 'tags', "新規タグを作成します: #{ new_tags.join(' ') }")
-    end
   rescue Tag::SectionLiteralParseError
     errors[:tags] = ['タグ区間の記法が不正です．']
   end

frontend/src/components/posts/import/PostImportTagLinks.tsx

@@ -12,7 +12,7 @@ const PostImportTagLinks: FC<Props> = ({ tags }) => {
     return null
 
   return (
-      <div className="flex flex-wrap gap-2">
+      <div className="flex flex-wrap text-xs gap-x-1">
 	{tags.map (tag => {
 	  const key = `${ tag.category }:${ tag.name }:${ tag.sectionLiterals?.join ('|') ?? '' }`
 	  return (
@@ -21,6 +21,7 @@ const PostImportTagLinks: FC<Props> = ({ tags }) => {
 		    tag={{
 			name: tag.name,
 			category: tag.category }}
+		    linkFlg={false}
 		    withWiki={false}
 		    withCount={false}/>
 		{tag.sectionLiterals?.map (literal => (

frontend/src/lib/postNewQueryState.ts

@@ -1,5 +1,5 @@
 const POST_NEW_REVIEW_PATH_PREFIX = '/posts/new?urls='
-const MAX_POST_NEW_REVIEW_TARGET_BYTES = 4096
+const MAX_POST_NEW_REVIEW_TARGET_BYTES = 6_144
 
 const textEncoder = new TextEncoder ()
 

frontend/src/lib/useUnsavedChangesGuard.tsx

@@ -96,7 +96,7 @@ export const UnsavedChangesGuardProvider: FC<PropsWithChildren> = ({ children })
     try
     {
       const confirmed = await dialogue.confirm ({
-          title: '変更が破棄してページ移動しますか?',
+          title: '変更を破棄してページ移動しますか?',
           confirmText: '変更を破棄して移動',
           variant: 'danger' })
       if (!(confirmed))