gtk: implement sensitive content reveal on paste confirmation

[maciekbartczak]

Fixes #4947 for gtk
This PR implements the senstive content hiding when displaying the paste confirmation dialog in secure input mode.

Following changes are implemented:

• in the blueprint for each dialog add a show/hide button that is not visible by default, and a Revealer that is revealed by default
• save the secure_input action value for each surface in the GTK apprt
• pass the value when initializing the paste confirmation dialog
• in the dialog code, alter the visibility of the content and reveal/hide buttons based on secure input flag value

Demo:

2025-03-02.17-37-11.mp4

I feel like this is already a nearly full implementation, but I'm leaving this as a draft for now, since i need to look into blueprints for Adwaita 1.2, and verify if it behaves properly when the dialog is in not-sensitive input mode and in OSC52 mode.

[jcollie]

As noted in the start of the PR, need to get this working for Adwaita 1.2.

[pluiedev]

From a UI design perspective I'm not sure if a background blur is idiomatic for GTK4 apps, although I'm not opposed to it. A separate row button is definitely not it, though... maybe an overlaid button in the corner could be used to reenable the overlay? I'm not sure why anyone would do this anyway.

[tristan957]

The blur is sweet

[jcollie]

I like the blur as well, but I agree that a separate button isn't the right UI. Generally clicking on the blurred panel is what I see for UI.

[maciekbartczak]

How about something like this?

2025-03-03.16-46-29.mp4

I'm not really sure what to think about the hide button, it feels out of place in there, maybe it is actually not needed at all?

[jcollie]

How about something like this?

Looks good!

I'm not really sure what to think about the hide button, it feels out of place in there, maybe it is actually not needed at all?

Yeah, I'd just get rid of the hide button, and let clicking on the text view itself hide the content again.

[tristan957]

What about a button similar to a password entry. Just an 👁️ button overlaid in the top right corner (or top left corner) in LTR languages?

[pluiedev]

Just an 👁️ button overlaid in the top right corner

This

[maciekbartczak]

Ok, that looks perfect to me, but I'm open to any suggestions 😄

2025-03-03.19-26-39.mp4

I'll address the rest of the required changes in the following days, since I don't have any more time for now.

[jcollie]

Ok, that looks perfect to me, but I'm open to any suggestions 😄

Looks good!

[tristan957]

For the overlay, I would add the .osd class.

[maciekbartczak]

Ok, that should be the final version. I've Added the implemenation for Adwaita 1.2, addressed the other issues and resolved merge conflicts.

[jcollie]

Thanks @maciekbartczak for putting up with all our nitpicks, great work!