Avoid re-composition if selection is non-empty, or on double-tap

Author: mihailik

src/input/ContentEditableInput.js

@@ -59,7 +59,18 @@ export default class ContentEditableInput {
       }
     })
 
-    on(div, "touchstart", () => input.forceCompositionEnd())
+    var lastTouchStart;
+    on(div, "touchstart", function () {
+      // do not force composition for double-tap, it breaks selection
+      if (lastTouchStart < +new Date() + DOUBLECLICK_DELAY) return
+      lastTouchStart = +new Date()
+
+      var startPos = cm.indexFromPos(cm.getCursor('from'))
+      var endPos = cm.indexFromPos(cm.getCursor('to'))
+      if (startPos !== endPos) return // do not force composition during selection
+
+      return input.forceCompositionEnd()
+    })
 
     on(div, "input", () => {
       if (!this.composing) this.readFromDOMSoon()