Only open a URL on the initial button press

[Glen-Tigera]

Problem

Ctrl+double-clicking a URL opens it twice — the browser gets two tabs for one gesture.

GDK delivers a double-click as BUTTON_PRESS, BUTTON_RELEASE, BUTTON_PRESS, _2BUTTON_PRESS. The URL branch of on_buttonpress tests only event.button and the Ctrl modifier:

if event.button == self.MOUSEBUTTON_LEFT:
    # Ctrl+leftclick on a URL should open it
    if self.config["link_single_click"] or event.get_state() & Gdk.ModifierType.CONTROL_MASK == Gdk.ModifierType.CONTROL_MASK:

so both the second BUTTON_PRESS and the _2BUTTON_PRESS reach open_url(). The _2BUTTON_PRESS guard near the top of the handler only covers Gtk.VScrollbar, not the terminal widget.

Same symptom in two other situations:

• link_single_click enabled — an ordinary double-click on a URL opens two tabs
• mouse switch bounce landing inside the double-click interval

Fix

Gate the URL branch on event.type == Gdk.EventType.BUTTON_PRESS.

Later event types fall through to the handler's closing return False, so VTE keeps handling double-click word selection and triple-click line selection exactly as before — only the duplicate open_url() calls go away.

Testing

Reproduced and verified on 2.1.3 (Ubuntu noble, GTK3, Wayland session, VTE 7600), with both link paths — OSC-8 hyperlinks via hyperlink_check_event and plain URLs via the regex match_check_event. Ctrl+double-click gave two browser tabs before the change and one after. Word and line selection unaffected.

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