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[evolution] e-editor.js: Remove all body attributes when using Plain Text mode

commit 6d39ec9824c4da06e81dd38e899eb27abfffd0f6
Author: Milan Crha <mcrha redhat com>
Date:   Wed Apr 29 13:48:33 2020 +0200

    e-editor.js: Remove all body attributes when using Plain Text mode

 data/webkit/e-editor.js | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
---
diff --git a/data/webkit/e-editor.js b/data/webkit/e-editor.js
index ff28aa65ce..231a1da797 100644
--- a/data/webkit/e-editor.js
+++ b/data/webkit/e-editor.js
@@ -2227,6 +2227,15 @@ EvoEditor.SetMode = function(mode)
                        if (mode == EvoEditor.MODE_PLAIN_TEXT) {
                                EvoEditor.convertTags();
                                EvoEditor.convertParagraphs(document.body, 0, 
EvoEditor.NORMAL_PARAGRAPH_WIDTH, false);
+
+                               if (document.body) {
+                                       // remove all body attributes, to not influence the Plain Text mode
+                                       var ii;
+
+                                       for (ii = document.body.attributes.length - 1; ii >= 0; ii--) {
+                                               
document.body.removeAttribute(document.body.attributes[ii].nodeName);
+                                       }
+                               }
                        } else {
                                EvoEditor.convertParagraphs(document.body, 0, -1, false);
                        }
@@ -5532,6 +5541,11 @@ EvoEditor.processLoadedContent = function()
                                        EvoEditor.linkifyText(node, false);
                        }
                }
+
+               // remove all body attributes, to not influence the Plain Text mode
+               for (ii = document.body.attributes.length - 1; ii >= 0; ii--) {
+                       document.body.removeAttribute(document.body.attributes[ii].nodeName);
+               }
        }
 
        // remove comments at the beginning, like the Evolution's "<!-- text/html -->"
@@ -5539,6 +5553,18 @@ EvoEditor.processLoadedContent = function()
                document.documentElement.removeChild(document.documentElement.firstChild);
        }
 
+       // remove unneeded data from the <head> as well
+       if (document.head) {
+               list = document.head.childNodes;
+
+               for (ii = list.length; ii >= 0; ii--) {
+                       node = list[ii];
+
+                       if (node && (node.nodeType == node.COMMENT_NODE || node.tagName == "META"))
+                               document.head.removeChild(node);
+               }
+       }
+
        document.body.removeAttribute("data-evo-draft");
        document.body.removeAttribute("data-evo-plain-text");
        document.body.removeAttribute("spellcheck");
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