6 files changed, 64 insertions, 0 deletions
diff --git a/editor/libeditor/HTMLEditorDataTransfer.cpp b/editor/libeditor/HTMLEditorDataTransfer.cpp
index ed350c0dd..c56fbead7 100644
--- a/editor/libeditor/HTMLEditorDataTransfer.cpp
+++ b/editor/libeditor/HTMLEditorDataTransfer.cpp
@@ -1538,6 +1538,13 @@ HTMLEditor::CanPaste(int32_t aSelectionType,
   NS_ENSURE_ARG_POINTER(aCanPaste);
   *aCanPaste = false;
 
+  // Always enable the paste command when inside of a HTML or XHTML document.
+  nsCOMPtr<nsIDocument> doc = GetDocument();
+  if (doc && doc->IsHTMLOrXHTML()) {
+    *aCanPaste = true;
+    return NS_OK;
+  }
+
   // can't paste if readonly
   if (!IsModifiable()) {
     return NS_OK;
diff --git a/editor/libeditor/TextEditorDataTransfer.cpp b/editor/libeditor/TextEditorDataTransfer.cpp
index 0388aa4a8..2cc2906fa 100644
--- a/editor/libeditor/TextEditorDataTransfer.cpp
+++ b/editor/libeditor/TextEditorDataTransfer.cpp
@@ -383,6 +383,13 @@ TextEditor::CanPaste(int32_t aSelectionType,
   NS_ENSURE_ARG_POINTER(aCanPaste);
   *aCanPaste = false;
 
+  // Always enable the paste command when inside of a HTML or XHTML document.
+  nsCOMPtr<nsIDocument> doc = GetDocument();
+  if (doc && doc->IsHTMLOrXHTML()) {
+    *aCanPaste = true;
+    return NS_OK;
+  }
+
   // can't paste if readonly
   if (!IsModifiable()) {
     return NS_OK;
diff --git a/editor/libeditor/tests/chrome.ini b/editor/libeditor/tests/chrome.ini
index 98db30001..dd13370a5 100644
--- a/editor/libeditor/tests/chrome.ini
+++ b/editor/libeditor/tests/chrome.ini
@@ -12,3 +12,4 @@ support-files = green.png
 [test_set_document_title_transaction.html]
 [test_texteditor_keyevent_handling.html]
 skip-if = (debug && os=='win') || (os == 'linux') # Bug 1116205, leaks on windows debug, fails delete key on linux
+[test_pasteImgTextarea.xul]
diff --git a/editor/libeditor/tests/mochitest.ini b/editor/libeditor/tests/mochitest.ini
index 4df3f606b..33b164819 100644
--- a/editor/libeditor/tests/mochitest.ini
+++ b/editor/libeditor/tests/mochitest.ini
@@ -247,3 +247,5 @@ skip-if = toolkit == 'android'
 [test_css_chrome_load_access.html]
 skip-if = toolkit == 'android' # chrome urls not available due to packaging
 [test_selection_move_commands.html]
+[test_pasteImgTextarea.html]
+skip-if = toolkit == 'android' # bug 1299578
diff --git a/editor/libeditor/tests/test_pasteImgTextarea.html b/editor/libeditor/tests/test_pasteImgTextarea.html
new file mode 100644
index 000000000..3168ae729
--- /dev/null
+++ b/editor/libeditor/tests/test_pasteImgTextarea.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/SpawnTask.js"></script>
+<img id="i" src="green.png">
+<textarea id="t"></textarea>
+
+<script>
+let loaded = new Promise(resolve => addLoadEvent(resolve));
+    add_task(function*() {
+        yield loaded;
+        SpecialPowers.setCommandNode(window, document.getElementById("i"));
+        SpecialPowers.doCommand(window, "cmd_copyImageContents");
+        let input = document.getElementById("t");
+        input.focus();
+        var controller =
+          SpecialPowers.wrap(input).controllers.getControllerForCommand("cmd_paste");
+        is(controller.isCommandEnabled("cmd_paste"), true,
+           "paste should be enabled in html textareas when an image is on the clipboard");
+    });
+</script>
diff --git a/editor/libeditor/tests/test_pasteImgTextarea.xul b/editor/libeditor/tests/test_pasteImgTextarea.xul
new file mode 100644
index 000000000..545027aa3
--- /dev/null
+++ b/editor/libeditor/tests/test_pasteImgTextarea.xul
@@ -0,0 +1,27 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
+<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css" type="text/css"?>
+<window xmlns:html="http://www.w3.org/1999/xhtml"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SpawnTask.js"></script>
+
+  <body xmlns="http://www.w3.org/1999/xhtml">
+    <html:img id="i" src="green.png" />
+    <html:textarea id="t"></html:textarea>
+  </body>
+  <script type="text/javascript"><![CDATA[
+    let loaded = new Promise(resolve => addLoadEvent(resolve));
+    add_task(function*() {
+        yield loaded;
+        SpecialPowers.setCommandNode(window, document.getElementById("i"));
+        SpecialPowers.doCommand(window, "cmd_copyImageContents");
+        let input = document.getElementById("t");
+        input.focus();
+        var controller =
+          SpecialPowers.wrap(input).controllers.getControllerForCommand("cmd_paste");
+        is(controller.isCommandEnabled("cmd_paste"), false,
+           "paste should not be enabled in xul textareas when an image is on the clipboard");
+    });
+  ]]></script>
+</window>