Can't change/view the views output templates or rescan the theme for new template files

Here is a start.
- This does not yet pick up templates correctly
- Got a "Notice: Undefined index: theme in Drupal\views\Plugin\views\PluginBase->themeFunctions() line 242"
- Clicking rescan gives you json (that is #2130205: Unable to "Expose this filter to visitors, to allow them to change it")

:(

Re-rolled the patch as it was failing on the latest D8. Going to give it a test.

- I get the list of templates, although it shows the base ones as missing but it is looking at the path core/modules/views/ instead of core/modules/views/templates
- Still get the json when clicking rescan.

Will investigate some more.

I have taken a closer look at this issue and as I am not sure how Views has been integrated with core I am a little lost.

Some of the things I have found.

1. Various mentions of .tpl.php files that should be .html.twig in 'core/modules/views/lib/Drupal/views/Plugin/views/display/DisplayPluginBase.php'
2. When clicking on the "Output: Templates" link in the Advanced pane of a view, the default templates are all missing because in the formatThemes function the $template_path is incorrect. Also, not all the $registry[$theme]['path'] have a 'path' in the array.
3. When clicking on 'Display Output' link in the Theme Information modal, there is an error that theme_path is an undefined index on line 1907 of 'core/modules/views/lib/Drupal/views/Plugin/views/display/DisplayPluginBase.php'. I did a watchdog() of $this->definition and there is no array key of theme_path

As I mentioned above, I don't have much knowledge about how Views has been integrated into core, so it may need someone with a bit more core experience to take a look at this one.

The patch from #3 still applies though without the need of a re-roll.

Just some work to at least not fail.

Nice, it picks up most of them!

Manually testing with the recent comments view, i got

1. views-view-fields.html.twig (File not found, in folder core/modules/views)
2. for views-view-field.html.twig the tooltip says "File found in folder ."
3. PHP Notice: Undefined index: template in Drupal\views\Plugin\views\display\DisplayPluginBase->formatThemes() (line 2101 of core/modules/views/lib/Drupal/views/Plugin/views/display/DisplayPluginBase.php).

With the front page view I got PHP Notice: Undefined index: theme in Drupal\views\Plugin\views\PluginBase->themeFunctions() (line 242 of core/modules/views/lib/Drupal/views/Plugin/views/PluginBase.php).

Tested on 8.x HEAD.
PHP 5.5.5
MariaDB 5.5.x

Drupal no longer blows up without the #6, spin for 1sek and nothing happen. Move it from critical to major? Patch does it's basic stuff but we are still missing tests.

What works

• The modal correct open, highlighting the correct template file.
• Created new tpl in Bartik and rescanned registry. Looking good.

Still broken

1. 'change theme' button is active even if the modal is is showing information for that theme. Confusing.
2. Pressing the button 'change theme' change the content of the page to:
   

   [{"command":"settings","settings":{"currentPathIsAdmin":true,"ajax":{"edit-cancel":{"event":"mousedown","keypress":true,"prevent":"click","accepts":"application\/vnd.drupal-ajax","url":"\/admin\/structure\/views\/ajax\/display\/content\/page_1\/analyze-theme","submit":{"_triggering_element_name":"op","_triggering_element_value":"Ok"}}}},"merge":true},{"command":"openDialog","selector":"#drupal-modal","settings":null,"data":"\u003Cform class=\u0022views-ui-edit-display-form\u0022 action=\u0022\/admin\/structure\/views\/ajax\/display\/content\/page_1\/analyze-theme\u0022 method=\u0022post\u0022 id=\u0022views-ui-edit-display-form\u0022 accept-charset=\u0022UTF-8\u0022\u003E\u003Cdiv\u003E\u003Cdiv class=\u0022scroll form-wrapper\u0022 data-drupal-views-scroll id=\u0022edit-options\u0022\u003E\u003Cdiv class=\u0022form-item description\u0022\u003E\u003Cp\u003EThis section lists all possible templates for the display plugin and for the style plugins, ordered roughly from the least specific to the most specific. The active template for each plugin -- which is the most specific template found on the system -- is highlighted in bold.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv class=\u0022container-inline\u0022\u003E\u003Cdiv class=\u0022form-item form-type-select form-item-theme\u0022\u003E\n \u003Clabel class=\u0022visually-hidden\u0022 for=\u0022edit-theme\u0022\u003ETheme\u003C\/label\u003E \u003Cselect id=\u0022edit-theme\u0022 name=\u0022theme\u0022 class=\u0022form-select\u0022\u003E\u003Coption value=\u0022bartik\u0022 selected=\u0022selected\u0022\u003EBartik\u003C\/option\u003E\u003Coption value=\u0022seven\u0022\u003ESeven\u003C\/option\u003E\u003Coption value=\u0022stark\u0022\u003EStark\u003C\/option\u003E\u003C\/select\u003E\n\u003C\/div\u003E\n\u003Cinput type=\u0022submit\u0022 id=\u0022edit-change\u0022 name=\u0022op\u0022 value=\u0022Change theme\u0022 class=\u0022button form-submit\u0022 \/\u003E\u003C\/div\u003E\u003Cdiv class=\u0022form-item\u0022\u003E\u003Cdiv class=\u0022item-list\u0022\u003E\u003Cul\u003E\u003Cli class=\u0022odd first\u0022\u003E\u003Ca href=\u0022\/admin\/structure\/views\/nojs\/display\/content\/page_1\/analyze-theme-display\u0022 class=\u0022views-ajax-link \u0022 title=\u0022Display output\u0022 id=\u0022views-page-1-analyze-theme-display\u0022\u003EDisplay output\u003C\/a\u003E: \u003Cdiv class=\u0022item-list\u0022\u003E\u003Cul\u003E\u003Cli class=\u0022odd first\u0022\u003Eviews-view.html.twig\u003C\/li\u003E\u003Cli class=\u0022even\u0022\u003E\u003Cstrong title=\u0022File found in folder core\/themes\/bartik\/templates\u0022\u003Eviews-view--content.html.twig\u003C\/strong\u003E\u003C\/li\u003E\u003Cli class=\u0022odd\u0022\u003Eviews-view--page.html.twig\u003C\/li\u003E\u003Cli class=\u0022even\u0022\u003Eviews-view--content--page.html.twig\u003C\/li\u003E\u003Cli class=\u0022odd\u0022\u003Eviews-view--default.html.twig\u003C\/li\u003E\u003Cli class=\u0022even\u0022\u003Eviews-view--page-1.html.twig\u003C\/li\u003E\u003Cli class=\u0022odd last\u0022\u003Eviews-view--content--page-1.html.twig\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003C\/li\u003E\u003Cli class=\u0022even\u0022\u003E\u003Ca href=\u0022\/admin\/structure\/views\/nojs\/display\/content\/page_1\/analyze-theme-style\u0022 class=\u0022views-ajax-link \u0022 title=\u0022Style output\u0022 id=\u0022views-page-1-analyze-theme-style\u0022\u003EStyle output\u003C\/a\u003E: \u003Cdiv class=\u0022item-list\u0022\u003E\u003Cul\u003E\u003Cli class=\u0022odd first\u0022\u003E\u003Cstrong title=\u0022File found in folder core\/modules\/views\/templates\u0022\u003Eviews-view-table.html.twig\u003C\/strong\u003E\u003C\/li\u003E\u003Cli class=\u0022even\u0022\u003Eviews-view-table--content.html.twig\u003C\/li\u003E\u003Cli class=\u0022odd\u0022\u003Eviews-view-table--page.html.twig\u003C\/li\u003E\u003Cli 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I think this is related to #2049209: Remove 'Theming information' feature from Views in favor of twig_debug also, maybe one can be closed?

Demoting to major, this is admin-ui facing only. dawehner worked on both these issues so I assume they're not duplicate, although I've personally worked on duplicate issues months apart thinking they were the same one, so you never know.

Demoting to major, this is admin-ui facing only. dawehner worked on both these issues so I assume they're not duplicate, although I've personally worked on duplicate issues months apart thinking they were the same one, so you never know.

HAHA!

#2049209: Remove 'Theming information' feature from Views in favor of twig_debug

Is this fixed? Have same problem in Drupal 8.0.6.