From dcbed07c952f380566996f38f3955a257c5a62db Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 18 Dec 2019 22:28:35 +0530
Subject: [PATCH] PDF Output: When an inline image is placed alone inside a
 block tag, ensure that it is not split over two pages.

---
 resources/pdf-preprint.js | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/resources/pdf-preprint.js b/resources/pdf-preprint.js
index 5037db298e..a78aec270c 100644
--- a/resources/pdf-preprint.js
+++ b/resources/pdf-preprint.js
@@ -11,19 +11,25 @@
     // wrap up long words that dont fit in the page
     document.body.style.overflowWrap = 'break-word';
 
-    var block_styles = {
+    var break_avoid_block_styles = {
         "run-in":1, "block":1, "table-row-group":1, "table-column":1, "table-column-group":1,
         "table-header-group":1, "table-footer-group":1, "table-row":1, "table-cell":1,
-        "table-caption":1, "inline-block:":1
+        "table-caption":1, // page-break-avoid does not work for inline-block either
     };
+
+    function avoid_page_breaks_inside(node) {
+        node.style.pageBreakInside = 'avoid';
+        node.style.breakInside = 'avoid';
+    }
+
     for (const img of document.images) {
         var style = window.getComputedStyle(img);
         if (style.maxHeight === 'none') img.style.maxHeight = '100vh';
         if (style.maxWidth === 'none') img.style.maxWidth = '100vw';
-        if (block_styles[style.display]) {
-            img.style.pageBreakInside = 'avoid';
-            img.style.breakInside = 'avoid';
-        }
+
+        var is_block = break_avoid_block_styles[style.display];
+        if (is_block) avoid_page_breaks_inside(img);
+        else if (img.parentNode && img.parentNode.childElementCount === 1) avoid_page_breaks_inside(img.parentNode);
     }
 
 })();