Small one: images sometimes sent twice

[qdhj]

Small one: if hit enter like crazy while uploading an image to chat, it will be sent twice.

• Device: PC
• OS: Windows 10
• Session Version: v1.10.8

[VityaSchel]

Just tested on macos, v1.12.3

Also happens when quickly clicking send button (in textbox) and image can be sent as many times as you pressed send button.

For some reason it only happens when you send image for the first time in app, after first time there are no delays between pressing send button and resetting message input, regardless of app restarts or selected conversation.

[VityaSchel]

This happens because getFiles function in CompositionBoxInner takes long time to complete and nothing stops user from calling onSendMessage() multiple times. I have added isSendingMessage boolean property to class and early return that checks if isSendingMessage is set to true. I have added finally clause to prevent user from app lock in sending message state if any errors occur in this function: #3100