commit 310c68a744ae8163c96b88944d96a6f6b14b3cdf
Author: John Preston <johnprestonmail@gmail.com>
Date:   Wed Dec 5 14:42:19 2018 +0400

    Disable DemiBold fallback for Semibold.
    
    This reverts changes from commit 089c4ceb30.
    
    There were complaints that Persian font becomes unreadable :(

diff --git a/Telegram/SourceFiles/ui/style/style_core_font.cpp b/Telegram/SourceFiles/ui/style/style_core_font.cpp
index a2ab5f89f..d268a71e1 100644
--- a/Telegram/SourceFiles/ui/style/style_core_font.cpp
+++ b/Telegram/SourceFiles/ui/style/style_core_font.cpp
@@ -58,9 +58,9 @@ FontData::FontData(int size, uint32 flags, int family, Font *other)
 
 	f.setPixelSize(size);
 	if (_flags & FontBold) {
-		f.setBold(_flags & FontBold);
-	} else if (fontFamilies[family] == "Open Sans Semibold") {
-		f.setWeight(QFont::DemiBold);
+		f.setBold(true);
+	//} else if (fontFamilies[family] == "Open Sans Semibold") {
+	//	f.setWeight(QFont::DemiBold);
 	}
 	f.setItalic(_flags & FontItalic);
 	f.setUnderline(_flags & FontUnderline);