Issue getting stuck when opening long text

[highgozhangyc]

Hello everyone,
When I copy a long text into RSyntaxTextArea, drag the horizontal scroll bar to the far right, and then use the mouse to operate the text content, we will find that the program is stuck, and the CPU resources occupied by the program will be very high. If we wait patiently for a while, the program will return to normal, but if we repeat the above operations, we will still encounter the same problem.
The text I used for testing will be attached.
Thank you everyone.
new 2.txt