Bug 147476

Description:
As a "person tasked with a CI/CD conform Presentation Template" who has created the first master slide I want to create more master slides based on the one already created so I can create a consistent set of master decks for my colleagues to choose from when creating presentations.

I created my master slide with consistent custom font, sizes, fiddled list indention, realigned AutoLayout boxes. Now I want create a second master slide based upon that. Of course the work and alignments and fiddling of the first slide I need to maintain on subsequent slides so there's no jumping of e.g. the headline row when switching slides.

Long story short, I could not find an intuitive way to get multiple master slides in, that then have a unified style. I can create a new master slide but it has the default styling and I would have to invest the same time again (presumably even more because layout adjustments are extremely fiddely to reproduce 100% so there's no pixel-jumping happening afterwards).

I've seen there are hacks via a saved "Template", use "Load.." in the change master slide dialog and hope the one selected creates a second slide (works a bit unreliable - if it's even intended). Also "Insert > Slide from File" inserts one new master slide. But both approaches failed for me to create a third one based on my intended design.

Proposal #1: Have an entry in the context menu of each master slide in the Slides menu: "Copy Master Slide" and a corresponding "paste" then accordingly.

Proposal #2: Make the style of the the AutoLayout boxes copy&paste'able from Masterslide to Masterslide.

Steps to Reproduce:
1. Create a master slide
2. Make a lot of pixel-perfect adjustments and change to a different font consistently
3. Try to create a second master slide like the first one as a working base for some significant adjustments

Actual Results:
Seems I cannot copy master slides intuitively. 

Expected Results:
I should be able to create copies of master slides and styles within master slides.


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
I'd consider it a UX issue in professional use of LibreOffice.