Notepad++ huge disaster! Epic mistake~

Although I have been engaged in programming for many years, this is the first time I have discovered such a serious error. This is a logical error in notepad++ and is irreversible after it occurs. I hope you will learn from this when programming in the future!
First, open a file as shown below:

I will open an html file first -.-

notepad++ has the function of merging divs~

After I deleted this line, the merged divs were gone~

But the actual display is still there!
Oh my god, has Notepad++ been open source for so long and no one has seen this bug?
Or maybe everyone doesn’t like merging things-.-

Copyright statement: Um. . . If you want to plagiarize, there is nothing I can do to stop you. .

The above introduces the huge disaster of Notepad++! Epic error~, including the relevant content, I hope it will be helpful to friends who are interested in PHP tutorials.