Auto hide find cursor window when the session that created it ceases to be...

Auto hide find cursor window when the session that created it ceases to be first responder. Issue 5637

sources/PTYTextView.m

@@ -532,6 +532,7 @@ static const int kDragThreshold = 3;
 - (BOOL)resignFirstResponder {
     [_altScreenMouseScrollInferer firstResponderDidChange];
     [self removeUnderline];
+    [self placeFindCursorOnAutoHide];
     DLog(@"resignFirstResponder %@", self);
     DLog(@"%@", [NSThread callStackSymbols]);
     return YES;