From 539f7015734ba97c355311ad1e2a28da9a39e4cd Mon Sep 17 00:00:00 2001
From: RumovZ <gp5glkw78@relay.firefox.com>
Date: Wed, 6 Jan 2021 20:25:13 +0100
Subject: [PATCH] Add exception handling for filter modifications

---
 qt/aqt/browser.py | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

diff --git a/qt/aqt/browser.py b/qt/aqt/browser.py
index d19dab499..d17167abe 100644
--- a/qt/aqt/browser.py
+++ b/qt/aqt/browser.py
@@ -1219,23 +1219,27 @@ QTableView {{ gridline-color: {grid} }}
                     items.append(txt)
                     txt = ""
             txt = " AND ".join(items)
-        if self.mw.app.keyboardModifiers() & Qt.AltModifier:
-            txt = self.col.backend.negate_search(txt)
-        cur = str(self.form.searchEdit.lineEdit().text())
-        if cur != self._searchPrompt:
-            mods = self.mw.app.keyboardModifiers()
-            if mods & Qt.ControlModifier and mods & Qt.ShiftModifier:
-                txt = self.col.backend.replace_search_term(search=cur, replacement=txt)
-            elif mods & Qt.ControlModifier:
-                txt = self.col.backend.concatenate_searches(
-                    sep=pb.ConcatenateSearchesIn.Separator.AND, searches=[cur, txt]
-                )
-            elif mods & Qt.ShiftModifier:
-                txt = self.col.backend.concatenate_searches(
-                    sep=pb.ConcatenateSearchesIn.Separator.OR, searches=[cur, txt]
-                )
-        self.form.searchEdit.lineEdit().setText(txt)
-        self.onSearchActivated()
+        try:
+            if self.mw.app.keyboardModifiers() & Qt.AltModifier:
+                txt = self.col.backend.negate_search(txt)
+            cur = str(self.form.searchEdit.lineEdit().text())
+            if cur != self._searchPrompt:
+                mods = self.mw.app.keyboardModifiers()
+                if mods & Qt.ControlModifier and mods & Qt.ShiftModifier:
+                    txt = self.col.backend.replace_search_term(search=cur, replacement=txt)
+                elif mods & Qt.ControlModifier:
+                    txt = self.col.backend.concatenate_searches(
+                        sep=pb.ConcatenateSearchesIn.Separator.AND, searches=[cur, txt]
+                    )
+                elif mods & Qt.ShiftModifier:
+                    txt = self.col.backend.concatenate_searches(
+                        sep=pb.ConcatenateSearchesIn.Separator.OR, searches=[cur, txt]
+                    )
+        except InvalidInput as e:
+            showWarning(str(e))
+        else:
+            self.form.searchEdit.lineEdit().setText(txt)
+            self.onSearchActivated()
 
     def _simpleFilters(self, items):
         ml = MenuList()