From 28a5069f959a4276b8280a78c925448f93d7121e Mon Sep 17 00:00:00 2001
From: Wenzhuo Liu <mgt@oi-wiki.org>
Date: Wed, 3 Jan 2024 17:41:41 +0800
Subject: [PATCH] Fix linebreak fallback tofu (#3123)

---
 crates/typst/src/text/font/book.rs     |   4 ++--
 tests/ref/bugs/2105-linebreak-tofu.png | Bin 0 -> 473 bytes
 tests/typ/bugs/2105-linebreak-tofu.typ |   1 +
 3 files changed, 3 insertions(+), 2 deletions(-)
 create mode 100644 tests/ref/bugs/2105-linebreak-tofu.png
 create mode 100644 tests/typ/bugs/2105-linebreak-tofu.typ

diff --git a/crates/typst/src/text/font/book.rs b/crates/typst/src/text/font/book.rs
index c875ab172..2e64533e2 100644
--- a/crates/typst/src/text/font/book.rs
+++ b/crates/typst/src/text/font/book.rs
@@ -93,8 +93,8 @@ impl FontBook {
         variant: FontVariant,
         text: &str,
     ) -> Option<usize> {
-        // Find the fonts that contain the text's first char ...
-        let c = text.chars().next()?;
+        // Find the fonts that contain the text's first non-space char ...
+        let c = text.chars().find(|c| !c.is_whitespace())?;
         let ids = self
             .infos
             .iter()
diff --git a/tests/ref/bugs/2105-linebreak-tofu.png b/tests/ref/bugs/2105-linebreak-tofu.png
new file mode 100644
index 0000000000000000000000000000000000000000..78f937eb2c9867d7ed4083a40e807c0514ddb897
GIT binary patch
literal 473
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z+5n-a3SDzVCavDnC)93P7+Ex7iJ|x3V82tDk5t^lMV=bCuUs1D6_?KysU7C!ax?Mc
z|IFy<<ms_*f7a>m|GoVAhc7bolt5rn&E&*J1||-L22zRt0*Nc0N7hT{_s?iGco69K
zF0gTe+XimAhd0i-S@1tonzQY$sFhRleEq=M?4nuTPL~#?MkY^7<=w55y)OI6)rZ@-
zWfN_GtNgH<k`=o0o2>OoQ?7-<E1A?+mWCcV<JxgnO+Cs+u~^WgSl3f~>2@_`n=js6
z;d&=HTJ-!E?V9#vOPYYm%js{|)K70zUl{!|PI}w5Q~Ieahn^*y9Xi`>)OzX^)3Ny3
z-?h4y-{*0U$g;9tv+k~`<ikTR|4x}#CELti=qz|B&Oc((m#6CsLws3todupveR*QP
zVCb$NWxJDq9_DFTJ>ycX`<LC-_arJaSQ%La9DosnOc-d^Jx~D$;cvzx`wTs{Mf7!m
O;>^?4&t;ucLK6Vok++Ee

literal 0
HcmV?d00001

diff --git a/tests/typ/bugs/2105-linebreak-tofu.typ b/tests/typ/bugs/2105-linebreak-tofu.typ
new file mode 100644
index 000000000..4dd5a2441
--- /dev/null
+++ b/tests/typ/bugs/2105-linebreak-tofu.typ
@@ -0,0 +1 @@
+#linebreak()中文