Describe the bug
When I paste some text containing newlines into message compose box and then style it as a quotation, then, after the message is sent, each line is formatted as a separate quotation. This issue only appears if a multiline text is pasted but not if it is directly typed (using Shift+Enter to type newlines).

To Reproduce
Steps to reproduce the behavior:

1. Open some plain text editor, type some text which includes newlines, and copy it.
2. In the message compose box, paste it.
3. Select the text and click a button with a quote to apply quote formatting.
4. Send the message.
5. In the edit box, the message is formatted properly, but after sending, each line is formatted as a separate quote.

Expected behavior
The entire text is formatted as a single quote.

Screenshots

Before sending:

After sending:

Expected behavior (this is what I get when I type the newline directly, instead of pasting it):

Desktop (please complete the following information):

• OS: Linux
• Browser: Firefox 128.12.0esr
• Version: Telegram WebK 2.2 (577)