Since r24627, the IMG plugin supports percentages in its width or height parameter to scale the image. For example...
{img fileId="2970" width="50%"}
... would display image 2970 with its original dimensions halved.
This was unfortunately broken for Tiki 9 and later on some systems by r37006. Setting dimensions this way is ignored, for example on French systems, which use a comma as decimal separator instead of a point.
The attached patch fixes in 2 ways. Any one is sufficient. The change to tiki-download_file.php is not quite clean as it alters $_GET.
Note that this exposes a lack of validation in tiki-download_file.php.
To help developers solve the bug, we kindly request that you demonstrate your bug on a show2.tiki.org instance. To start, simply select a version and click on "Create show2.tiki.org instance". Once the instance is ready (in a minute or two), as indicated in the status window below, you can then access that instance, login (the initial admin username/password is "admin") and configure the Tiki to demonstrate your bug. Priority will be given to bugs that have been demonstrated on show2.tiki.org.
To help developers solve the bug, we kindly request that you demonstrate your bug on a show.tikiwiki.org instance. To start, simply select a version and click on "Create show.tikiwiki.org instance". Once the instance is ready (in a minute or two), as indicated in the status window below, you can then access that instance, login (the initial admin username/password is "admin") and configure the Tiki to demonstrate your bug. Priority will be given to bugs that have been demonstrated on show.tikiwiki.org.