[fractal/fractal-next] message-text: Make emoji-only messages bigger

[Julian Sparber <jsparber src gnome org>]

commit 15c2803c70445d2620275888af116efd79b0e56b
Author: Kévin Commaille <zecakeh tedomum fr>
Date:   Sat Dec 25 10:42:05 2021 +0100

    message-text: Make emoji-only messages bigger

 Cargo.lock                                          |  1 +
 Cargo.toml                                          |  1 +
 data/resources/style.css                            |  4 ++++
 .../content/room_history/message_row/text.rs        | 21 +++++++++++++++++++++
 4 files changed, 27 insertions(+)
---
diff --git a/Cargo.lock b/Cargo.lock
index c4a959c9..80c329d6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1001,6 +1001,7 @@ dependencies = [
  "once_cell",
  "qrcode",
  "rand 0.8.4",
+ "regex",
  "secret-service",
  "serde",
  "serde_json",
diff --git a/Cargo.toml b/Cargo.toml
index e4271a56..83f44389 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,6 +34,7 @@ gst = {version = "0.17", package = "gstreamer"}
 gst_base = {version = "0.17", package = "gstreamer-base"}
 gst_video = {version = "0.17", package = "gstreamer-video"}
 image = {version = "0.23", default-features = false, features=["png"]}
+regex = "1.5.4"
 
 [dependencies.sourceview]
 package = "sourceview5"
diff --git a/data/resources/style.css b/data/resources/style.css
index c2b64b43..5b172e45 100644
--- a/data/resources/style.css
+++ b/data/resources/style.css
@@ -209,6 +209,10 @@ headerbar.flat {
   margin-left: 46px;
 }
 
+.room-history .event-content .emoji {
+  font-size: 3em;
+}
+
 .room-history .event-content .thumbnail {
   border-radius: 6px;
   background-color: @light_3;
diff --git a/src/session/content/room_history/message_row/text.rs 
b/src/session/content/room_history/message_row/text.rs
index d08ea060..31a26b2c 100644
--- a/src/session/content/room_history/message_row/text.rs
+++ b/src/session/content/room_history/message_row/text.rs
@@ -5,6 +5,8 @@ use html2pango::{
     html_escape, markup_links,
 };
 use matrix_sdk::ruma::events::room::message::{FormattedBody, MessageFormat};
+use once_cell::sync::Lazy;
+use regex::Regex;
 use sourceview::prelude::*;
 
 use crate::session::{
@@ -13,6 +15,21 @@ use crate::session::{
     UserExt,
 };
 
+static EMOJI_REGEX: Lazy<Regex> = Lazy::new(|| {
+    Regex::new(
+        r"(?x)
+        ^
+        [\p{White_Space}\p{Emoji_Component}]*
+        [\p{Emoji}--\p{Decimal_Number}]+
+        [\p{White_Space}\p{Emoji}\p{Emoji_Component}--\p{Decimal_Number}]*
+        $
+        # That string is made of at least one emoji, except digits, possibly more,
+        # possibly with modifiers, possibly with spaces, but nothing else
+        ",
+    )
+    .unwrap()
+});
+
 mod imp {
     use super::*;
     use once_cell::sync::Lazy;
@@ -199,6 +216,10 @@ impl MessageText {
             child
         };
 
+        if EMOJI_REGEX.is_match(text) {
+            child.add_css_class("emoji");
+        }
+
         if use_markup {
             child.set_markup(text);
         } else {