From 8fa77c8282b10e7de36863c4df6583a62a55354c Mon Sep 17 00:00:00 2001
From: Classic298 <27028174+Classic298@users.noreply.github.com>
Date: Thu, 22 Oct 2026 00:01:10 +0200
Subject: [PATCH] fix: PowerPoint preview centres titles the file aligns left
 (#32876)

In the PowerPoint preview, a title or subtitle that the file sets to left alignment was drawn centred, the same as one with no alignment at all. Decks made by python-pptx and most deck generators set the alignment on every paragraph, so their left-aligned title slides all came out centred. The preview now keeps a title the file aligns left on the left, and only centres titles and subtitles that leave the alignment open.

Fixes #32873
---
 src/lib/utils/pptxToHtml.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/lib/utils/pptxToHtml.ts b/src/lib/utils/pptxToHtml.ts
index afe718ddc6..542bcd8e91 100644
--- a/src/lib/utils/pptxToHtml.ts
+++ b/src/lib/utils/pptxToHtml.ts
@@ -257,6 +257,8 @@ const paragraphAlign = (
 	const align = para.getElementsByTagName('a:pPr')[0]?.getAttribute('algn');
 	if (align === 'ctr') return 'center';
 	if (align === 'r') return 'right';
+	// l and the justified modes the preview cannot draw render from the left
+	if (align) return 'left';
 
 	const type = normalizePlaceholderType(ph?.type ?? '');
 	if (type === 'title' || type === 'subTitle') return 'center';