[BUG] Solid color background missing <a:effectLst/> in <p:bgPr>, triggers repair dialog

[NAM-MAN]

Description

When a slide has a solid color background (via slide.background = { color: '...' }), the generated <p:bgPr> element is missing the <a:effectLst/> child element. PowerPoint expects this element and triggers the repair dialog when it is absent.

Root Cause

In gen-objects.ts (compiled: pptxgen.cjs.js around L5103):

// Image backgrounds correctly include <a:effectLst/>:
strSlideXml += `<p:bg><p:bgPr><a:blipFill ...><a:effectLst/></p:bgPr></p:bg>`;

// But solid color backgrounds do NOT:
strSlideXml += `<p:bg><p:bgPr>${genXmlColorSelection(slide.background)}</p:bgPr></p:bg>`;
//                                                                      ^^^ missing <a:effectLst/>

The image background path includes <a:effectLst/> but the solid color path does not.

Steps to Reproduce

1. Create a slide with a solid color background: slide.background = { color: 'FF0000' }
2. Generate the .pptx
3. Open in Microsoft PowerPoint → repair dialog appears
4. Diff original vs repaired file: <a:effectLst/> is added inside <p:bgPr>

Expected Behavior

Solid color backgrounds should include <a:effectLst/>, consistent with image backgrounds:

<p:bg><p:bgPr><a:solidFill><a:srgbClr val="FF0000"/></a:solidFill><a:effectLst/></p:bgPr></p:bg>

Suggested Fix

strSlideXml += `<p:bg><p:bgPr>${genXmlColorSelection(slide.background)}<a:effectLst/></p:bgPr></p:bg>`;

Environment

• PptxGenJS: 4.0.1
• PowerPoint for Mac (Microsoft 365)
• Node.js 22.x