[bugfix] Fix existing bio text showing as HTML (#531)

* fix existing bio text showing as HTML

- updated replaced mentions to include instance
- strips HTML from account source note in Verify handler
- update text formatter to use buffers for string writes

Signed-off-by: kim <grufwub@gmail.com>

* go away linter

Signed-off-by: kim <grufwub@gmail.com>

* change buf reset location, change html mention tags

Signed-off-by: kim <grufwub@gmail.com>

* reduce FindLinks code complexity

Signed-off-by: kim <grufwub@gmail.com>

* fix HTML to text conversion

Signed-off-by: kim <grufwub@gmail.com>

* Update internal/regexes/regexes.go

Co-authored-by: Mina Galić <mina.galic@puppet.com>

* use improved html2text lib with more options

Signed-off-by: kim <grufwub@gmail.com>

* fix to produce actual plaintext from html

Signed-off-by: kim <grufwub@gmail.com>

* fix span tags instead written as space

Signed-off-by: kim <grufwub@gmail.com>

* performance improvements to regex replacements, fix link replace logic for un-html-ing in the future

Signed-off-by: kim <grufwub@gmail.com>

* fix tag/mention replacements to use input string, fix link replace to not include scheme

Signed-off-by: kim <grufwub@gmail.com>

* use matched input string for link replace href text

Signed-off-by: kim <grufwub@gmail.com>

* remove unused code (to appease linter :sobs:)

Signed-off-by: kim <grufwub@gmail.com>

* improve hashtagFinger regex to be more compliant

Signed-off-by: kim <grufwub@gmail.com>

* update breakReplacer to include both unix and windows line endings

Signed-off-by: kim <grufwub@gmail.com>

* add NoteRaw field to Account to store plaintext account bio, add migration for this, set for sensitive accounts

Signed-off-by: kim <grufwub@gmail.com>

* drop unnecessary code

Signed-off-by: kim <grufwub@gmail.com>

* update text package tests to fix logic changes

Signed-off-by: kim <grufwub@gmail.com>

* add raw note content testing to account update and account verify

Signed-off-by: kim <grufwub@gmail.com>

* remove unused modules

Signed-off-by: kim <grufwub@gmail.com>

* fix emoji regex

Signed-off-by: kim <grufwub@gmail.com>

* fix replacement of hashtags

Signed-off-by: kim <grufwub@gmail.com>

* update code comment

Signed-off-by: kim <grufwub@gmail.com>

Co-authored-by: Mina Galić <mina.galic@puppet.com>

internal/text/plain.go

@@ -20,12 +20,17 @@ package text
 
 import (
 	"context"
-	"fmt"
 	"strings"
 
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 )
 
+// breakReplacer replaces new-lines with HTML breaks.
+var breakReplacer = strings.NewReplacer(
+	"\r\n", "<br/>",
+	"\n", "<br/>",
+)
+
 func (f *formatter) FromPlain(ctx context.Context, plain string, mentions []*gtsmodel.Mention, tags []*gtsmodel.Tag) string {
 	content := preformat(plain)
 
@@ -42,10 +47,10 @@ func (f *formatter) FromPlain(ctx context.Context, plain string, mentions []*gts
 	content = f.ReplaceMentions(ctx, content, mentions)
 
 	// replace newlines with breaks
-	content = strings.ReplaceAll(content, "\n", "<br />")
+	content = breakReplacer.Replace(content)
 
 	// wrap the whole thing in a pee
-	content = fmt.Sprintf(`<p>%s</p>`, content)
+	content = `<p>` + content + `</p>`
 
 	return postformat(content)
 }