Image with file name containing extra period (.) not supported.

[ndunand]

Steps to reproduce:

• add an image with name like "sky.net.png"
• check that everything is fine: image displays, etc.
• attempt to flip or rotate image
• error is displayed:

error/The requested file was not found: sky.net.png

More information about this error

Debug info: 
Error code: The requested file was not found: sky.net.png
$a contents:
Stack trace:
line 463 of /lib/setuplib.php: moodle_exception thrown
line 79 of /mod/lightboxgallery/imageedit.php: call to print_error()

Using Moodle 2.7 and mod_lightboxgallery version 2014060300.

Note: looking at the mdl_files table there is apparently a "sky.png" gallery_images file, as well as a "sky.png.png" gallery_thumbs file.