Fix bugs #6871 and #8119.

Both bugs above were due to a missing screen update. This patch
updates the current view after dispatching a lyxserver command
and thus solves both.

The patch is quite strightforward and the only difficulty was due
to the fact that the lyxserver needs the result of the dispatched
command. Now, GuiApplication::dispatch(FuncRequest const &) does
right this, but does not return the result, while
GuiApplication::dispatch(FuncRequest const &, DispatchResult &)
is called by the former but does not return the result. So, I
split the first one, isolating the code performing the update,
such that the second one can also update the current view when
the caller is the lyx server. When the action is initiated by
anything different from the lyx server, the behavior is unchanged.

src/FuncRequest.h

@@ -35,6 +35,7 @@ public:
 		TOOLBAR, // A toolbar icon
 		KEYBOARD, // a keyboard binding
 		COMMANDBUFFER, 
+		LYXSERVER, 
 		TOC
 	};
 

src/Server.cpp

@@ -1173,10 +1173,10 @@ void Server::callback(string const & msg)
 			// connect to the lyxfunc in the single GuiView we
 			// support currently. (Lgb)
 
-			FuncRequest const fr(lyxaction.lookupFunc(cmd), arg);
+			FuncRequest fr(lyxaction.lookupFunc(cmd), arg);
+			fr.setOrigin(FuncRequest::LYXSERVER);
 			DispatchResult dr;
 			theApp()->dispatch(fr, dr);
-			theApp()->dispatch(FuncRequest(LFUN_PARAGRAPH_UPDATE));
 			string const rval = to_utf8(dr.message());
 
 			// all commands produce an INFO or ERROR message

src/ServerSocket.cpp

@@ -141,9 +141,10 @@ void ServerSocket::dataCallback(int fd)
 		string const key = line.substr(0, pos);
 		if (key == "LYXCMD") {
 			string const cmd = line.substr(pos + 1);
+			FuncRequest fr(lyxaction.lookupFunc(cmd));
+			fr.setOrigin(FuncRequest::LYXSERVER);
 			DispatchResult dr;
-			theApp()->dispatch(lyxaction.lookupFunc(cmd), dr);
-			theApp()->dispatch(FuncRequest(LFUN_PARAGRAPH_UPDATE));
+			theApp()->dispatch(fr, dr);
 			string const rval = to_utf8(dr.message());
 			if (dr.error())
 				client->writeln("ERROR:" + cmd + ':' + rval);

src/frontends/qt4/GuiApplication.cpp

@@ -1140,7 +1140,12 @@ void GuiApplication::dispatch(FuncRequest const & cmd)
 	// This is done unless explicitly requested otherwise
 	dr.screenUpdate(Update::FitCursor);
 	dispatch(cmd, dr);
+	updateCurrentView(cmd, dr);
+}
 
+
+void GuiApplication::updateCurrentView(FuncRequest const & cmd, DispatchResult & dr)
+{
 	if (!current_view_)
 		return;
 
@@ -1311,6 +1316,13 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 		return;
 	};
 
+	if (cmd.origin() == FuncRequest::LYXSERVER) {
+		if (current_view_ && current_view_->currentBufferView())
+			current_view_->currentBufferView()->cursor().saveBeforeDispatchPosXY();
+		// we will also need to redraw the screen at the end
+		dr.screenUpdate(Update::FitCursor);
+	}
+
 	// Assumes that the action will be dispatched.
 	dr.dispatched(true);
 
@@ -1663,6 +1675,9 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 			current_view_->dispatch(cmd, dr);
 		break;
 	}
+
+	if (cmd.origin() == FuncRequest::LYXSERVER)
+		updateCurrentView(cmd, dr);
 }
 
 

src/frontends/qt4/GuiApplication.h

@@ -192,6 +192,8 @@ private:
 	///
 	void validateCurrentView();
 	///
+	void updateCurrentView(FuncRequest const & cmd, DispatchResult & dr);
+	///
 	bool closeAllViews();
 	/// read the given ui (menu/toolbar) file
 	bool readUIFile(QString const & name, bool include = false);