Set CLIPBOARD_STATE to sensitive if x-kde-passwordManagerHint is in the MIME list

[Bwc9876]

Password managers like KeepassXC pass the x-kde-passwordManagerHint MIME type to signal to clipboard applications that the information is sensitive and shouldn't be forwarded. This PR will set CLIPBOARD_STATE to sensitive if that MIME type is present.

This is my first time using C in a while so apologies if it's a bit messy, let me know if any changes are needed :)

[Lcchy]

I was looking into preventing my passwords from being saved in my clipboard manager (cliphist), thanks for the PR!

The CLIPBOARD_STATE=sensitive part works for me although I am unable to paste as the only offered type is then "x-kde-passwordManagerHint":

$ wl-copy word --type x-kde-passwordManagerHint; wl-paste --list-types
x-kde-passwordManagerHint

I don't really know the project but I fixed it with:

diff --git a/src/wl-copy.c b/src/wl-copy.c
index b040cb6..dabc775 100644
--- a/src/wl-copy.c
+++ b/src/wl-copy.c
@@ -295,7 +295,7 @@ int main(int argc, argv_t argv) {
         if (options.mime_type != NULL) {
             source_offer(copy_action->source, options.mime_type);
         }
-        if (options.mime_type == NULL || mime_type_is_text(options.mime_type)) {
+        if (options.mime_type == NULL || mime_type_is_text(options.mime_type) || strcmp(options.mime_type, "x-kde-passwordManagerHint") == 0) {
             /* Offer a few generic plain text formats */
             source_offer(copy_action->source, text_plain);
             source_offer(copy_action->source, text_plain_utf8);

That makes the sensitive data have a few text types as a fallback.

$ wl-copy word --type x-kde-passwordManagerHint; wl-paste --list-types
x-kde-passwordManagerHint
text/plain
text/plain;charset=utf-8
TEXT
STRING
UTF8_STRING

(Referencing this issue here as it wasn't: #177)

[MrSmoer]

KeePassXC also puts the content secretunder the x-kde-passwordManagerHint MIME-Type. Maybe that should be checked here as well, in order to not introduce inconsistencies.