The selection and lengths for the resampling of the outline were based
on the original curves rather than the generated outline curves causing
out of bounds access.
---
#### Problem
Exporting grease pencil objects and setting the "Sampling" option
to higher than 0.0 will cause a crash during export.
In a debug build the following assert is triggert:
```
BLI_assert failed: C:\Users\leons\dev\blender-git\blender\source\blender\blenlib\BLI_virtual_array.hh:625, operator [](), at 'index < this->size()'
```
##### Steps to reproduce the issue
1. Open the attached .blend file: [gp-export-resample-crash.blend](/attachments/3be6839f-3376-4d75-ad54-077f1eeab472)
2. Select the "Monkey" grease pencil object and export it as PDF or SVG
3. In the export dialog set the "Sampling" to something other than `0.0` e.g. `0.2`
4. Confirm.
5. Blender should crash.
Pull Request: https://projects.blender.org/blender/blender/pulls/136585
2204d1308d