Give fat cursors the width of the character after them

Author: krydos

src/display/selection.js

@@ -37,6 +37,11 @@ export function drawSelectionCursor(cm, head, output) {
   cursor.style.top = pos.top + "px"
   cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px"
 
+  if (/cm-fat-cursor/.test(cm.getWrapperElement().className)) {
+    let charPos = charCoords(cm, head, "div", null, null);
+    cursor.style.width = Math.max(0, charPos.right - charPos.left) + "px";
+  }
+
   if (pos.other) {
     // Secondary cursor, shown when on a 'jump' in bi-directional text
     let otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"))