From 951570a97f50dda0905ea1ecc4e779a2357642c3 Mon Sep 17 00:00:00 2001
From: Robin Townsend <robintown@tcakoi.dev>
Date: Wed, 22 Jul 2020 00:44:01 +0000
Subject: [PATCH] Escape single quotes in composer placeholder

Signed-off-by: Robin Townsend <robintown@tcakoi.dev>
---
 src/components/views/rooms/BasicMessageComposer.tsx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/components/views/rooms/BasicMessageComposer.tsx b/src/components/views/rooms/BasicMessageComposer.tsx
index 1e0a639aac..2a909bdd26 100644
--- a/src/components/views/rooms/BasicMessageComposer.tsx
+++ b/src/components/views/rooms/BasicMessageComposer.tsx
@@ -219,7 +219,9 @@ export default class BasicMessageEditor extends React.Component<IProps, IState>
     };
 
     private showPlaceholder() {
-        this.editorRef.current.style.setProperty("--placeholder", `'${this.props.placeholder}'`);
+        // escape single quotes
+        const placeholder = this.props.placeholder.replace(/'/g, '\\\'');
+        this.editorRef.current.style.setProperty("--placeholder", `'${placeholder}'`);
         this.editorRef.current.classList.add("mx_BasicMessageComposer_inputEmpty");
     }