Add setting, clean up drawing, fix true color

typings/xterm-headless.d.ts

@@ -78,6 +78,14 @@ declare module 'xterm-headless' {
      */
     cursorWidth?: number;
 
+    /**
+     * Whether to draw custom block element and box drawing characters instead of using the font.
+     * This should typically result in better rendering with continuous lines. Note that this
+     * doesn't work with the DOM renderer which renders all characters using the font. The default
+     * is true.
+     */
+    customBlockAndBoxCharacters?: boolean;
+
     /**
      * Whether input should be disabled.
      */

typings/xterm.d.ts

@@ -90,6 +90,14 @@ declare module 'xterm' {
      */
     cursorWidth?: number;
 
+    /**
+     * Whether to draw custom block element and box drawing characters instead of using the font.
+     * This should typically result in better rendering with continuous lines. Note that this
+     * doesn't work with the DOM renderer which renders all characters using the font. The default
+     * is true.
+     */
+    customBlockAndBoxCharacters?: boolean;
+
     /**
      * Whether input should be disabled.
      */