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01518: Page name UTF-8 characters lost when login page used while creating new page

Description:
Using an UTF-8 instance of PmWiki
All pages have an edit password set
The user is logged out from all permissions

Try to create a new page, say https://example.nz/Test/TētahiWhārangi?action=edit in the address bar
PmWiki shows https://example.nz/Test/TētahiWhārangi?action=edit in the address bar and prompts for the password
Enter the password and click on Login
PmWiki shows https://example.nz/Test/T?hiWh?rangi?action=edit in the address bar

The UTF-8 characters have been lost
PmWiki displays "Editing Test.T" on the page

simon March 23, 2025, at 06:48 PM

PS note for some reason the browser changed the pasted URL characters copied from the address bar to "https://example.nz/Test/T%c4%93hiWh%c4%81rangi?action=edit". The page name is "TētahiWhārangi""

This indeed happens on KiwiWiki (IIS) but doesn't seem to be a problem here on Test.TētahiWhārangi?action=edit, I must type a password myself to edit or on my local wiki (Apache), or on the TTC wiki (LightSpeed). Can you enable diag on yours? It may be something unique to Windows IIS servers. --Petko March 23, 2025, at 07:34 PM

Thanks, you can add this early to config.php: --Petko March 23, 2025, at 08:48 PM

# fix for international URLs on IIS
if (!empty($_SERVER['UNENCODED_URL'])) {
  $_SERVER['REQUEST_URI'] = $_SERVER['UNENCODED_URL'];
}