Possible errors in Programming Editor

When inserting a block start character "{" in line 1 and block end character "}" a few lines further down and then save the program, you will experience a disaster when you start the program again. Almost the entire program has disappeared. Only the top line and a few other lines are back, and these are all located in one long line.
The problem exists only when the block start character "{" is located at line 1
I've observed the problem in version 5.4.2 as well as in 5.4.3, it is also observed in both Windows XP and Windows 7
I was so lucky that I had just backed up all my data, otherwise, I had lost 256 lines of coding.

William

Thanks for the bug report, we'll look into it.

However collapsing blocks are actually designed to collapse to the line above the {, so you should really always have something above the first { anyway.

Will_collapse_on_this_line:
{
code
code
code
}