[client] Send a viewport update before requesting new chunks

Nibriboard/ClientFiles/BoardWindow.js

@@ -320,6 +320,23 @@ class BoardWindow extends EventEmitter
 		window.addEventListener("resize", this.matchWindowSize.bind(this));
 	}
 	
+	/**
+	 * Sends the current viewport to the server.
+	 */
+	sendViewport() {
+		this.rippleLink.send({
+			Event: "ViewportUpdate",
+			NewViewport: {
+				X: parseInt(this.viewport.x),
+				Y: parseInt(this.viewport.y),
+				Width: parseInt(this.viewport.width),
+				Height: parseInt(this.viewport.height)
+			}
+		});
+		
+		this.lastViewportUpdate = +new Date();
+	}
+	
 	/**
 	 * Handles events generated by pan-zoom, the package that handles the
 	 * dragging and zooming of the whiteboard.
@@ -345,17 +362,7 @@ class BoardWindow extends EventEmitter
 			if(+new Date() - this.lastViewportUpdate < (1 / this.cursorSyncer.cursorUpdateFrequency) * 1000)
 				return false;
 			
-			this.rippleLink.send({
-				Event: "ViewportUpdate",
-				NewViewport: {
-					X: parseInt(this.viewport.x),
-					Y: parseInt(this.viewport.y),
-					Width: parseInt(this.viewport.width),
-					Height: parseInt(this.viewport.height)
-				}
-			});
-			
-			this.lastViewportUpdate = +new Date();
+			this.sendViewport();
 		}).bind(this));
 	}
 	

Nibriboard/ClientFiles/ChunkCache.js

@@ -61,7 +61,9 @@ class ChunkCache
 		}
 		
 		if(missingChunks.length > 0) {
-			// Asynchronously request them from the server
+			// Make sure that the server knows our current viewport
+			this.boardWindow.sendViewport();
+			// Asynchronously request the missing chunks from the server
 			this.boardWindow.rippleLink.send({
 				"Event": "ChunkUpdateRequest",
 				"ForgottenChunks": missingChunks