Is there an existing issue for this?

• I have searched the existing issues

Description of the Issue

When we hide already hidden lines, Notepad++ freezes/crash. It's not systematic, and I mostly feel that the issue occurs when the End of File (EoF) is included in the hidden section.

Steps To Reproduce

1/ Download a Notepad++ Portable Minimalist version to ensure there are no unwanted plugins.

2/ Extract it.

3/ Launch Notepad++

4/ Write the following lines:

{
	// sample
	// sample
}
{
	// sample
	// sample
}

5/ Highlight the last 4 lines (lines 8 to 5) and press ALT + H to hide them.

6/ Now, you should only see this:

{
	// sample
	// sample
}
}

With the fold markers on line 4 (>) and line 8 (<).

7/ Highlight all 5 lines (lines 8 to 1, including lines 5, 6, and 7, which are hidden) and press ALT + H to hide them.

8/ Notepad++ freezes.

Current Behavior

Notepad++ Freeze.

Expected Behavior

I expect the lines to hide and unhide normally while respecting previous fixes that ensure hidden lines remain hidden when folding or unfolding.

I'm a beginner programmer, and I acknowledge that understanding the logic behind what should be hidden or not, keeping track of what needs to remain hidden, and managing overlapping 'un/hide line' and 'un/fold line' operations can be quite a headache.

I would fully understand and accept that this bug is not fixable in order to avoid breaking the rest of Notepad++'s code.

Debug Information

Notepad++ v8.6.9   (64-bit)
Build time : Jul 12 2024 - 05:09:25
Path : C:\Downloads\npp.8.6.9.portable.minimalist.x64\notepad++.exe
Command Line : C:\Downloads\npp.8.6.9.portable.minimalist.x64\bug.txt
Admin mode : OFF
Local Conf mode : ON
Cloud Config : OFF
Periodic Backup : ON
OS Name : Windows 8.1 (64-bit)
OS Build : 9600.20045
Current ANSI codepage : 1252
Plugins : none

Anything else?

Related issues ?

#13682
#12184