Issue 6440 - Disable common textarea features to improve performance

desktop-options.html

Index: desktop-options.html
===================================================================
--- a/desktop-options.html
+++ b/desktop-options.html
@@ -296,17 +296,18 @@
             <div id="empty-custom-filters">
               <p class="i18n_options_customFilters_tip"></p>
               <button class="i18n_options_customFilters_start primary" data-action="edit-custom-filters">
               </button>
               <p>
                 <a class="i18n_options_customFilters_learn" id="link-filters" target="_blank"></a>
               </p>
             </div>
-            <textarea id="custom-filters-raw" rows="15"></textarea>
+            <textarea id="custom-filters-raw" rows="15" spellcheck="false"
+                      autocapitalize="off" autocomplete="off" autocorrect="off"></textarea>

[Thomas Greiner, 2018/03/05 16:40:57]

According to
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/textarea#attr-autoc...
"autocapitalize" is only supported by WebKit on iOS so it's not relevant for us.

I haven't found any documentation about "autocorrect" though so that may be
another non-standard attribute that doesn't apply to us. Based on the sources I
found, most of them are referring to iOS so presumably this one is also only
supported by WebKit on iOS.

[a.giammarchi, 2018/03/05 16:54:43]

but it doesn't hurt having it in, right?
I've used all attributes that uBo uses as shown in the ticket:
https://issues.adblockplus.org/attachment/ticket/6440/ubo%20textarea%20code%2...

plus I've added everything that could bother any browser.

Since there's no hurt in having those attributes in, and if browsers will ever
implement those we'll be already prepared for that, are we sure we don't want to
just be preemptively sure we disable those features?

             <div class="side-controls">
               <button id="custom-filters-edit" class="i18n_options_customFilter_edit secondary" data-action="edit-custom-filters">
               </button>
               <div class="side-controls" id="custom-filters-raw-controls">
                 <button class="i18n_options_customFilter_cancel secondary" data-action="cancel-custom-filters"></button>
                 <button class="i18n_options_customFilter_save primary" data-action="save-custom-filters"></button>
               </div>
             </div>