From c194cec5205c2d5a591c50e5b09ffad400925970 Mon Sep 17 00:00:00 2001
From: BurningTreeC <sh.ub.fm@gmail.com>
Date: Tue, 23 Jan 2018 17:49:24 +0100
Subject: [PATCH] tc-body background transparent if background attachment
 (#3100)

* tc-body transparent if background attachment

if you go fullscreen with the fullscreen button, the tc-body background color hides the background attachments - so make it transparent if $:/themes/tiddlywiki/vanilla/settings/backgroundimage isn't empty

* if background attachment macro

macro to make tc-body background transparent
---
 core/wiki/macros/CSS.tid           | 4 ++++
 themes/tiddlywiki/vanilla/base.tid | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/core/wiki/macros/CSS.tid b/core/wiki/macros/CSS.tid
index 1b7c35eff..a5b68ea07 100644
--- a/core/wiki/macros/CSS.tid
+++ b/core/wiki/macros/CSS.tid
@@ -70,3 +70,7 @@ column-count: $columns$;
 \define if-no-sidebar(text)
 <$reveal state="$:/state/sidebar" type="nomatch" text="yes" default="yes">$text$</$reveal>
 \end
+
+\define if-background-attachment(text)
+<$reveal state="$:/themes/tiddlywiki/vanilla/settings/backgroundimage" type="nomatch" text="">$text$</$reveal>
+\end
diff --git a/themes/tiddlywiki/vanilla/base.tid b/themes/tiddlywiki/vanilla/base.tid
index e50d87388..b00b36476 100644
--- a/themes/tiddlywiki/vanilla/base.tid
+++ b/themes/tiddlywiki/vanilla/base.tid
@@ -85,6 +85,14 @@ body.tc-body {
 	fill: <<colour foreground>>;
 }
 
+<<if-background-attachment """
+
+body.tc-body {
+        background-color: transparent;
+}
+
+""">>
+
 h1, h2, h3, h4, h5, h6 {
 	line-height: 1.2;
 	font-weight: 300;