Make themes.toHex use getColor, ensure .selectable

js/term/screen.js

@@ -92,7 +92,7 @@ module.exports = class TermScreen extends EventEmitter {
     this.selection = {
       // when false, this will prevent selection in favor of mouse events,
       // though alt can be held to override it
-      selectable: true,
+      selectable: null,
 
       // selection start and end (x, y) tuples
       start: [0, 0],

js/term/themes.js

@@ -145,10 +145,7 @@ exports.getColor = function (i, palette = []) {
 exports.toHex = function (shade, themeN) {
   if (/^\d+$/.test(shade)) {
     shade = +shade
-    if (shade < 16) shade = themes[themeN][shade]
-    else {
-      shade = exports.buildColorTable()[shade]
-    }
+    return exports.getColor(shade, themes[themeN])
   }
   return shade
 }