fixed window resizing issue

locked window's min-width and min-height, enabled resizing/fullscreen

main.js

@@ -89,14 +89,14 @@ function initMainWindow() {
 
   // Create the browser window.
   mainWindow = new BrowserWindow({
-    // on Win, the width of app is few px smaller than it should be.
-    // this triggers smaller breakpoints
-    // this size should cause the same layout results on all OSes
+    // width: on Win, the width of app is few px smaller than it should be
+    // (this triggers smaller breakpoints) - this size should cause
+    // the same layout results on all OSes
+    // minWidth/minHeight: both need to be specified or none will work
     width:     1270,
-    minWidth:  961,
-    maxWidth:  1920,
+    minWidth:  1270,
     height:    675,
-    resizable: false,
+    minHeight: 675,
     webPreferences: {
       nodeIntegration:  false,
       sandbox:          true,