Insert new slide to specific position

[GulsahKose]

When we insert a new slide via context menu of the slidesorter, new slide should be inserted on pointer position instead of end of the last selected slide.

Change-Id: Ie5efb78d6b6ee468cda150cc416cbd2ab536d6dd

• Resolves: #
• Target version: master

Summary

TODO

• [ ] ...

Checklist

• [ ] Code is properly formatted
• [ ] All commits have Change-Id
• [ ] I have run tests with make check
• [ ] I have issued make run and manually verified that everything looks okay
• [ ] Documentation (manuals or wiki) has been updated or is not required

[GulsahKose]

Here is the followup core patch https://gerrit.libreoffice.org/c/core/+/153539

[pedropintosilva]

@GulsahKose didn't this got already merged?

[eszkadev]

@GulsahKose can we rebase this PR, seems to be useful

[GulsahKose]

Just rebased the patch, I'm working on...

[GulsahKose]

This patch is ready to review. Related core patch is here: https://gerrit.libreoffice.org/c/core/+/172113

[eszkadev]

works good in general, but I found corner case: impress-2024-08-22_08.58.14.webm

[GulsahKose]

@eszkadev It should be fixed now.