bug fix in readerfont

After set font in ReaderFont:onReadSettings, we have to send UpdatePos
event in order to set m_is_rendered(member of LVDocView) to true.

Otherwise position inside document will be reset to 0 on first view
render, this makes the first page of document is always displayed on
document open.

So far, I don't know why this call will alter the value of m_is_rendered.
It just works...

frontend/document/credocument.lua

@@ -102,7 +102,7 @@ function CreDocument:getFontFace()
 end
 
 function CreDocument:setFontFace(new_font_face)
-	if new_font_face  then
+	if new_font_face then
 		self._document:setFontFace(new_font_face)
 	end
 end
@@ -112,7 +112,7 @@ function CreDocument:getFontSize()
 end
 
 function CreDocument:setFontSize(new_font_size)
-	if new_font_size  then
+	if new_font_size then
 		self._document:setFontSize(new_font_size)
 	end
 end

frontend/ui/reader/readerfont.lua

@@ -60,6 +60,11 @@ function ReaderFont:onReadSettings(config)
 		self.font_size = self.ui.document:getFontSize()
 	end
 	self.ui.document:setFontSize(self.font_size)
+	-- Dirty hack: we have to add folloing call in order to set
+	-- m_is_rendered(member of LVDocView) to true. Otherwise position inside
+	-- document will be reset to 0 on first view render.
+	-- So far, I don't know why this call will alter the value of m_is_rendered.
+	self.ui:handleEvent(Event:new("UpdatePos"))
 end
 
 function ReaderFont:onShowFontMenu()