gashacon

Les Bessant

WordPress 3.5 introduced a new feature – when images are inserted into posts, the title attribute is not included in the image tag. This was done with the best of intentions relating to accessibility, as documented on <a href="https://core.trac.wordpress.org/ticket/18984" rel="nofollow ugc">Trac</a>
Unfortunately, this causes problems for some Lightbox plugins, quite apart from stopping image tooltips from appearing.
This plugin hooks into the media_send_to_editor filter and inserts the image title into the html inserted into the post.
The original author, LesBessant, sadly passed away and in the meantime the original plugin was closed. I plan to keep the plugin up to date whenever an update breaks it.

IMG Title Restore

Restores the title attribute when images are inserted into posts

natekinkead

When you upload a new image in WordPress, this plugin will use the file name to automatically fill in the Title, Alt text, Caption fields, and Description so you don’t have to do it manually.

Image Automatic Alt Text and Caption

Automatically fills in the Alt text, Caption, and Description from the image file name of new image uploads.

IMG Title Restore vs Image Automatic Alt Text and Caption