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	message_move: Fix new_topic_name in topic already exists warning.
				
					
				
			In the move topic modal, the `new_topic_name` input is disabled if
the user doesn't have permission to move messages between topics.
This commit fixes a bug where `new_topic_name` is undefined since its
input is disabled. This causes `show_topic_already_exists_warning()`
to throw an AssertionError. Hence, the warning is not shown.
Specifically, this bug occurs when a user moves a topic to an
already existing topic in a different channel when he has permission
to move messages between channels but not between topics.
(cherry picked from commit 62745ddccb)
			
			
This commit is contained in:
		
				
					committed by
					
						
						Tim Abbott
					
				
			
			
				
	
			
			
			
						parent
						
							8dcc2bf592
						
					
				
				
					commit
					d3ff0cb95f
				
			@@ -616,7 +616,12 @@ export async function build_move_topic_to_stream_popover(
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        if ($("#move_topic_modal select.message_edit_topic_propagate").val() === "change_one") {
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					        if ($("#move_topic_modal select.message_edit_topic_propagate").val() === "change_one") {
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            return false;
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					            return false;
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        }
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					        }
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        const {new_topic_name} = get_params_from_form();
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					        let {new_topic_name} = get_params_from_form();
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					        if (!settings_data.user_can_move_messages_to_another_topic()) {
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					            // new_topic_name is undefined since the new topic input is disabled when
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					            // user does not have permission to edit topic.
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					            new_topic_name = args.topic_name;
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					        }
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        assert(new_topic_name !== undefined);
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					        assert(new_topic_name !== undefined);
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        // Don't show warning for empty topic as the user is probably
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					        // Don't show warning for empty topic as the user is probably
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        // about to type a new topic name. Note that if topics are
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					        // about to type a new topic name. Note that if topics are
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