Only focus inputs if the viewport is large enough (#55)

Only focus inputs if the viewport is large enough

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/55

src/main.js

@@ -113,9 +113,14 @@ import './registerServiceWorker'
 // Set focus
 Vue.directive('focus', {
 	// When the bound element is inserted into the DOM...
-	inserted: function (el) {
-		// Focus the element
-		el.focus()
+	inserted: el => {
+		// Focus the element only if the viewport is big enough
+		// auto focusing elements on mobile can be annoying since in these cases the
+		// keyboard always pops up and takes half of the available space on the screen.
+		// The threshhold is the same as the breakpoints in css.
+		if (window.innerWidth > 769) {
+			el.focus()
+		}
 	}
 })