I created a plugin for MCE. It seeds to be working fine accept for the following:

At first load the screen width is detected (with the help of some javascript code) to be able to determine how many items are displayed per row. This works fine only on a full HD (1920x1080) screen the resolution is detected but it looks like the viewport of the browser (it's an html app) is not the complete width of the screen.

Is this correct and what is the max width? Or should my app be able to show at full hd resolution?