fix latex render progress; display more frequently

pylib/anki/media.py

@@ -6,6 +6,7 @@ from __future__ import annotations
 import os
 import re
 import sys
+import time
 import urllib.error
 import urllib.parse
 import urllib.request
@@ -176,23 +177,22 @@ class MediaManager:
 
         If an error is encountered, returns (note_id, error_message)
         """
-        last_progress = intTime()
-        for c, (nid, mid, flds) in enumerate(
-            self.col.db.execute("select id, mid, flds from notes")
+        last_progress = time.time()
+        checked = 0
+        for (nid, mid, flds) in self.col.db.execute(
+            "select id, mid, flds from notes where flds like '%[%'"
         ):
-            if "[" not in flds:
-                continue
 
             model = self.col.models.get(mid)
             _html, errors = render_latex_returning_errors(flds, model, self.col)
             if errors:
                 return (nid, "\n".join(errors))
 
-            if c % 10 == 0:
-                elap = last_progress - intTime()
-                if elap >= 1 and progress_cb is not None:
+            checked += 1
+            elap = time.time() - last_progress
+            if elap >= 0.3 and progress_cb is not None:
                 last_progress = intTime()
-                    if not progress_cb(c + 1):
+                if not progress_cb(checked):
                     return None
 
         return None

qt/aqt/mediacheck.py

@@ -98,8 +98,11 @@ class MediaChecker:
         self.progress_dialog = self.mw.progress.start()
         try:
             out = self.mw.col.media.render_all_latex(self._on_render_latex_progress)
+            if self.progress_dialog.wantCancel:
+                return
         finally:
             self.mw.progress.finish()
+            self.progress_dialog = None
 
         if out is not None:
             nid, err = out