Fix IE11 pasting losing line breaks

- walk child of [cm-text] if [cm-text] is empty in order to find line breaks
- treat br/li/table as blocks
- always addText from on textNode not node.textContent

Author: muan

src/input/ContentEditableInput.js

@@ -413,8 +413,8 @@ function domTextBetween(cm, from, to, fromLine, toLine) {
   function walk(node) {
     if (node.nodeType == 1) {
       let cmText = node.getAttribute("cm-text")
-      if (cmText != null) {
-        addText(cmText || node.textContent.replace(/\u200b/g, ""))
+      if (cmText) {
+        addText(cmText)
         return
       }
       let markerID = node.getAttribute("cm-marker"), range
@@ -425,13 +425,15 @@ function domTextBetween(cm, from, to, fromLine, toLine) {
         return
       }
       if (node.getAttribute("contenteditable") == "false") return
-      let isBlock = /^(pre|div|p)$/i.test(node.nodeName)
+      let isBlock = /^(pre|div|p|li|table|br)$/i.test(node.nodeName)
+      if (!/^br$/i.test(node.nodeName) && node.textContent.length == 0) return
+
       if (isBlock) close()
       for (let i = 0; i < node.childNodes.length; i++)
         walk(node.childNodes[i])
       if (isBlock) closing = true
     } else if (node.nodeType == 3) {
-      addText(node.nodeValue.replace(/\u00a0/g, " "))
+      addText(node.nodeValue.replace(/\u00a0/g, " ").replace(/\u200b/g, ""))
     }
   }
   for (;;) {