fix early ending of composition mode

lib/components/content.js

@@ -58,6 +58,7 @@ class Content extends React.Component {
   constructor(props) {
     super(props)
     this.tmp = {}
+    this.tmp.compositions = 0
     this.forces = 0
   }
 
@@ -148,6 +149,7 @@ class Content extends React.Component {
 
   onCompositionStart = (e) => {
     this.tmp.isComposing = true
+    this.tmp.compositions++
   }
 
   /**
@@ -160,8 +162,13 @@ class Content extends React.Component {
 
   onCompositionEnd = (e) => {
     this.forces++
+    const count = this.tmp.compositions
 
+    // The `count` check here ensures that if another composition starts
+    // before the timeout has closed out this one, we will abort unsetting the
+    // `isComposing` flag, since a composition in still in affect.
     setTimeout(() => {
+      if (this.tmp.compositions > count) return
       this.tmp.isComposing = false
     })
   }
@@ -267,7 +274,6 @@ class Content extends React.Component {
       return
     }
 
-
     if (
       (key == 'enter') ||
       (key == 'backspace') ||