Devices, methods, and graphical user interfaces for messaging

An electronic device, comprising:

• a display;
• a touch-sensitive surface;
• one or more processors;
• memory;
• and
• one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for:
• displaying a messaging user interface on the display, the messaging user interface including a conversation transcript of a messaging session between a user of the electronic device and at least one other user, including a first other user, wherein the conversation transcript includes a plurality of messages and a plurality of message regions, each message region containing a respective message of the plurality of messages;
• receiving a first message within the messaging session from an electronic device that corresponds to the first other user included in the messaging session;
• responding to receipt of the first message by:
• determining whether the first message includes an enhanced message content trigger, wherein, if included in the first message, the enhanced message content trigger is included in the first message in response to selection of an enhanced message content display option by the first other user from a plurality of enhanced message content display options;
• in accordance with a determination that the first message includes the enhanced message content trigger:
• displaying the first message in a first message region of the plurality of message regions in the conversation transcript on the display without concurrent display of enhanced message content that corresponds to the trigger, and
• subsequent to displaying the first message in the first message region in the conversation transcript on the display, concurrently displaying:
• the first message in the first message region in the conversation transcript, and
• enhanced message content that corresponds to the trigger, wherein:
• the enhanced message content display option selected by the first other user is an option for applying an effect to at least one message region other than the first message region in the conversation transcript;
• the enhanced message content corresponds to the enhanced message content display option selected by the first other user from a plurality of enhanced message content display options;
• the enhanced message content display option is selected by the first other user separately from input of content of the first message by the first other user;
• the enhanced message content includes content that applies an effect to at least one message region, other than the first message region, of the plurality of message regions, in the conversation transcript;
• and
• the enhanced message content is distinct from the displayed first message in the first message region;
• and,
• in accordance with a determination that the first message does not include the enhanced message content trigger, displaying the first message in the first message region in the conversation transcript on the display.

A method, comprising:

• at an electronic device having one or more processors, memory, a touch-sensitive surface, and a display:
• displaying a messaging user interface on the display, the messaging user interface including a conversation transcript of a messaging session between a user of the electronic device and at least one other user, including a first other user, wherein the conversation transcript includes a plurality of messages and a plurality of message regions, each message region containing a respective message of the plurality of messages;
• receiving a first message within the messaging session from an electronic device that corresponds to the first other user included in the messaging session, the received first message including an enhanced message content trigger, wherein the enhanced message content trigger is included in the first message in response to selection of an enhanced message content display option by the first other user from a plurality of enhanced message content display options;
• responding to receipt of the first message by:
• displaying the first message in a first message region of the plurality of message regions in the conversation transcript on the display without concurrent display of enhanced message content that corresponds to the trigger, and
• subsequent to displaying the first message in the first message region in the conversation transcript on the display, concurrently displaying:
• the first message in the first message region in the conversation transcript, and,
• enhanced message content that corresponds to the trigger, wherein:
• the enhanced message content display option selected by the first other user is an option for applying an effect to at least one message region other than the first message region in the conversation transcript;
• the enhanced message content corresponds to the enhanced message content display option selected by the first other user from a plurality of enhanced message content display options;
• the enhanced message content display option is selected by the first other user separately from input of content of the first message by the first other user;
• the enhanced message content includes content that applies an effect to at least one message region, other than the first message region, of the plurality of message regions in the conversation transcript;
• and
• the enhanced message content is distinct from the displayed first message in the first message region.