Add min-width to sidebar so it won't shrink when the window gets too small (#373)

src/app/common/elements/resizablesidebar.tsx

@@ -151,7 +151,7 @@ class ResizableSidebar extends React.Component<ResizableSidebarProps> {
         const isCollapsed = mainSidebarModel.getCollapsed();
 
         return (
-            <div className={cn("sidebar", className, { collapsed: isCollapsed })} style={{ width }}>
+            <div className={cn("sidebar", className, { collapsed: isCollapsed })} style={{ width, minWidth: width }}>
                 <div className="sidebar-content">{children(this.toggleCollapsed)}</div>
                 <div
                     className="sidebar-handle"

src/app/sidebar/sidebar.tsx

@@ -266,8 +266,6 @@ class MainSideBar extends React.Component<MainSideBarProps, {}> {
     }
 
     render() {
-        const sidebarWidth = GlobalModel.mainSidebarModel.getWidth();
-
         return (
             <ResizableSidebar
                 className="main-sidebar"