Background in master template broken by 3.6.0

[viral-sh]

Category

• Enhancement
• Bug
• Question
• Documentation gap/issue

Version

Please specify what version of the library you are using: [ v3.6.0 ]

Please specify what version(s) of PowerPoint you are targeting: [ ]

Expected / Desired Behavior / Question

When we add "path" to the background property of a slide master, it should add the image at the path as background.

  pptx.defineSlideMaster({
    title: "mytitle",
    background: { fill: theme.background1, path: "../bg-image.jpeg" },
    ...

Observed Behavior

Above worked till v3.5.0. But when we upgraded to v3.6.0 it's broken. It triggers repair PPT dialog and does not even add the image.

Steps to Reproduce

• Create a master and add a background image to it via background.path property.
• Create a PPT and try to open it.
• Repair PPT dialog should trigger and background image should not be visible

[gitbrent]

Thanks @viral-sh

The recent changes to the background prop allowed for more than one <p:bg> tag to be created in the slideLayoutN.xml files, which caused the warning.

The API now supports more than 1 background prop correctly.