From 38c26ea90e1fdce791c87f00b1458311c4ee6ff7 Mon Sep 17 00:00:00 2001
From: Nicolas Buquet <nbuquet@buquet-net.com>
Date: Mon, 20 Nov 2023 19:25:46 +0100
Subject: [PATCH] When respecting Preferred Font size, only touch font size and
 keep other font attributes

---
 .../MatrixKit/Views/MXKMessageTextView.m      | 25 +++++++++++++++++--
 changelog.d/927.bugfix                        |  1 +
 2 files changed, 24 insertions(+), 2 deletions(-)
 create mode 100644 changelog.d/927.bugfix

diff --git a/Riot/Modules/MatrixKit/Views/MXKMessageTextView.m b/Riot/Modules/MatrixKit/Views/MXKMessageTextView.m
index e5d1b6153..6cf574da0 100644
--- a/Riot/Modules/MatrixKit/Views/MXKMessageTextView.m
+++ b/Riot/Modules/MatrixKit/Views/MXKMessageTextView.m
@@ -94,6 +94,10 @@ - (void)setAttributedText:(NSAttributedString *)attributedText
     if (@available(iOS 15.0, *)) {
         [self flushPills];
     }
+
+    // Tchap: set text type to prefered font to rerspect user text size
+    attributedText = [self respectPreferredFontForAttributedString:attributedText];
+
     [super setAttributedText:attributedText];
 
     if (@available(iOS 15.0, *)) {
@@ -101,9 +105,26 @@ - (void)setAttributedText:(NSAttributedString *)attributedText
         // forcing the layoutManager to redraw the glyphs at all NSAttachment positions.
         [self vc_invalidateTextAttachmentsDisplay];
     }
+}
+
+// Tchap: Update font size using preferred font settings but keeping other attributes
+- (NSAttributedString *)respectPreferredFontForAttributedString:(NSAttributedString *)sourceString
+{
+    UIFont *preferredFont = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
     
-    // Tchap: set text type to prefered font to rerspect user text size
-    self.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
+    NSMutableAttributedString *workString = [sourceString mutableCopy];
+    
+    [workString beginEditing];
+    [workString enumerateAttribute:NSFontAttributeName
+                           inRange:NSMakeRange(0, workString.length)
+                           options:0
+                        usingBlock:^(id  _Nullable value, NSRange range, BOOL * _Nonnull stop) {
+        [workString removeAttribute:NSFontAttributeName range:range];
+        [workString addAttribute:NSFontAttributeName value:[(UIFont *)value fontWithSize:preferredFont.pointSize] range:range];
+    }];
+    [workString endEditing];
+    
+    return workString;
 }
 
 - (void)registerPillView:(UIView *)pillView
diff --git a/changelog.d/927.bugfix b/changelog.d/927.bugfix
new file mode 100644
index 000000000..7fa1a3e57
--- /dev/null
+++ b/changelog.d/927.bugfix
@@ -0,0 +1 @@
+Conserver les enrichissements de texte quand on respecte le réglage de la taille de texte de l'utilisateur
\ No newline at end of file