Hopefully fix some copy-paste stuff.

src/Window.zig

@@ -1995,6 +1995,16 @@ fn focusedReview(self: *Window) ?*Review {
     return tab.view.focusedReview();
 }
 
+/// Whether the keyboard focus sits on `widget` or on something inside it.
+///
+/// Finer-grained than the `focused*` lookups above, which answer at the
+/// granularity of a pane: a pane is one of these even while the focus is in a
+/// bar it draws around its content rather than in the content itself.
+fn focusIsIn(self: *Window, widget: *gtk.Widget) bool {
+    const focus = self.window.as(gtk.Window).getFocus() orelse return false;
+    return focus == widget or focus.isAncestor(widget) != 0;
+}
+
 /// Split the visible tab's focused pane, adding a pane of the given kind.
 fn addPane(self: *Window, kind: View.Kind) void {
     const tab = self.activeTab() orelse return;
@@ -2244,12 +2254,27 @@ fn perform(self: *Window, action: shortcuts.Action) bool {
         .toggle_sidebar => self.toggleSidebar(),
         .open_settings => self.openSettings(),
 
-        // Only a terminal needs us to encode a paste for it. A web pane has its
-        // own clipboard handling, so the key is left alone rather than
-        // swallowed here.
+        // Ctrl+Shift+V is the terminal's paste chord, and this window means it
+        // to be *the* paste chord — but nothing below us binds the shifted
+        // form. GTK's entries and WebKit's pages both paste on plain Ctrl+V
+        // and neither has a binding for Ctrl+Shift+V, so leaving the key alone
+        // over a web pane doesn't hand the paste to the page, it drops it. A
+        // pane that isn't a terminal has to be handed the paste explicitly.
+        //
+        // Only when the page itself holds the focus, though: a web pane's
+        // address bar is an ordinary GTK entry sitting above the view, and
+        // pasting into the page while the caret is in the address bar would
+        // put the text somewhere the user isn't looking.
         .paste => {
-            const terminal = self.focusedTerminal() orelse return false;
-            terminal.pasteFrom(.standard);
+            if (self.focusedTerminal()) |terminal| {
+                terminal.pasteFrom(.standard);
+            } else if (self.focusedBrowser()) |browser| {
+                if (!self.focusIsIn(browser.view.as(gtk.Widget))) return false;
+                browser.view.executeEditingCommand("Paste");
+            } else if (self.focusedReview()) |pane| {
+                if (!self.focusIsIn(pane.view.as(gtk.Widget))) return false;
+                pane.view.executeEditingCommand("Paste");
+            } else return false;
         },
 
         // With nothing selected the key is declined rather than swallowed, so a

src/webkit.zig

@@ -67,6 +67,13 @@ pub const WebView = opaque {
     extern fn webkit_web_view_stop_loading(*WebView) void;
     pub const stopLoading = webkit_web_view_stop_loading;
 
+    /// Run one of WebKit's editing commands — "Paste", "Copy", "Cut" and the
+    /// rest — against whatever the page has focused, as if the page's own key
+    /// binding for it had fired. A command with nothing to act on, such as a
+    /// paste with no editable field focused, does nothing.
+    extern fn webkit_web_view_execute_editing_command(*WebView, [*:0]const u8) void;
+    pub const executeEditingCommand = webkit_web_view_execute_editing_command;
+
     /// The view's find controller, created on first use and owned by the view,
     /// so this hands back the same object every time and it does not outlive
     /// the view it came from.