Fixed space of action animation in middle text for different scales.

Telegram/SourceFiles/history/view/history_view_send_action.cpp

@@ -296,15 +296,17 @@ bool SendActionPainter::updateNeedsAnimating(crl::time now, bool force) {
 						const auto index = newTypingString.size()
 							- lang.rightIndexChoosingStickerReplacement(
 								isNamed);
-						animationLeft = _st.font->width(
-							newTypingString,
-							0,
-							index);
+						animationLeft = Ui::Text::String(
+							_st,
+							newTypingString.mid(0, index)).maxWidth();
 
 						if (!_spacesCount) {
-							_spacesCount = std::ceil(
+							// We have to use QFontMetricsF instead of
+							// FontData::spacew for more precise calculation.
+							const auto mf = QFontMetricsF(_st.font->f);
+							_spacesCount = std::round(
 								_sendActionAnimation.width()
-									/ _st.font->spacew);
+									/ mf.horizontalAdvance(' '));
 						}
 						newTypingString = newTypingString.replace(
 							index,