The PureBasic IDE lets you search and replace through a selection or an entire file. It would be wonderful if it let you search and replace through multiple files, that is, through all open files, and all files in a project.
I can do this now by alt-tabbing to Notepad++ (and I'm sure Linux and OSX folks can do something similar), but I
like the PureBasic IDE.

This change seems relatively easy to implement and would require no changes to the language.