Fix deleting previously selected torrent when trying to clear search field using Command + Delete (#4245)

* Fix deleting previously selected torrent when trying to clear search field using Command + Delete

Fixes #3599

* Fixes after code review

* Fixes after code review

* chore: make clang-format happy

Co-authored-by: Daniil Subbotin <d.subbotin@opends.tech>

macosx/Controller.mm

@@ -4772,6 +4772,11 @@ void onTorrentCompletenessChanged(tr_torrent* tor, tr_completeness status, bool
     {
         BOOL warning = NO;
 
+        if (self.fFilterBar.isFocused == YES)
+        {
+            return NO;
+        }
+
         for (Torrent* torrent in self.fTableView.selectedTorrents)
         {
             if (torrent.active)

macosx/FilterBarController.h

@@ -33,6 +33,7 @@ extern const NSInteger kGroupFilterAllTag;
 - (IBAction)setGroupFilter:(id)sender;
 - (void)reset:(BOOL)updateUI;
 - (void)focusSearchField;
+- (BOOL)isFocused;
 
 - (void)setCountAll:(NSUInteger)all
              active:(NSUInteger)active

macosx/FilterBarController.mm

@@ -264,6 +264,13 @@ typedef NS_ENUM(NSInteger, FilterTypeTag) {
     [self.view.window makeFirstResponder:self.fSearchField];
 }
 
+- (BOOL)isFocused
+{
+    NSTextView* textView = (NSTextView*)self.fSearchField.window.firstResponder;
+    return [self.fSearchField.window.firstResponder isKindOfClass:NSTextView.class] &&
+        [self.fSearchField.window fieldEditor:NO forObject:nil] != nil && [self.fSearchField isEqualTo:textView.delegate];
+}
+
 - (void)searchFieldDidStartSearching:(NSSearchField*)sender
 {
     [self.fSearchFieldMinWidthConstraint animator].constant = 95;