fix: slowdowns after import; hard to read popup

QTextEdit() will pin the CPU at 100% for seconds to minutes when
fed a large string to display - work around it by switching to
QPlainTextEdit().

Also strip HTML before showing the user - easier to read, and less
text to display. And turn off word wrap, as it makes it easier to skim,
and further reduces the work the widget needs to do.

https://forums.ankiweb.net/t/big-issue-where-anki-gets-slow-when-you-import-this-deck/7050

pylib/anki/importing/anki2.py

@@ -10,7 +10,7 @@ from anki.consts import *
 from anki.decks import DeckManager
 from anki.importing.base import Importer
 from anki.lang import TR
-from anki.utils import intTime, joinFields, splitFields
+from anki.utils import intTime, joinFields, splitFields, stripHTMLMedia
 
 GUID = 1
 MID = 2
@@ -71,7 +71,9 @@ class Anki2Importer(Importer):
     ######################################################################
 
     def _logNoteRow(self, action: str, noteRow: List[str]) -> None:
-        self.log.append("[%s] %s" % (action, noteRow[6].replace("\x1f", ", ")))
+        self.log.append(
+            "[%s] %s" % (action, stripHTMLMedia(noteRow[6].replace("\x1f", ", ")))
+        )
 
     def _importNotes(self) -> None:
         # build guid -> (id,mod,mid) hash & map of existing note ids

qt/aqt/importing.py

@@ -398,7 +398,7 @@ def importFile(mw: AnkiQt, file: str) -> None:
                 if "\n" not in log:
                     tooltip(log)
                 else:
-                    showText(log)
+                    showText(log, plain_text_edit=True)
 
             mw.reset()
 

qt/aqt/utils.py

@@ -204,6 +204,7 @@ def showText(
     minHeight: int = 400,
     title: str = "Anki",
     copyBtn: bool = False,
+    plain_text_edit: bool = False,
 ) -> Optional[Tuple[QDialog, QDialogButtonBox]]:
     if not parent:
         parent = aqt.mw.app.activeWindow() or aqt.mw
@@ -212,8 +213,14 @@ def showText(
     disable_help_button(diag)
     layout = QVBoxLayout(diag)
     diag.setLayout(layout)
-    text = QTextBrowser()
-    text.setOpenExternalLinks(True)
+    if plain_text_edit:
+        # used by the importer
+        text = QPlainTextEdit()
+        text.setReadOnly(True)
+        text.setWordWrapMode(QTextOption.NoWrap)
+    else:
+        text = QTextBrowser()
+        text.setOpenExternalLinks(True)
     if type == "text":
         text.setPlainText(txt)
     else: