GTK: Don't apply unfocused options when searching (#11224)

If you have multiple splits and start searching naturally the focus
transfers over to the search widget which would apply the unfocused
options. This could make it difficult to view your matches from
searching without re-focusing the surface.

This was discovered when I tested
https://github.com/ghostty-org/ghostty/discussions/11218 (which is a
different issue)

src/apprt/gtk/class/surface.zig

@@ -823,10 +823,11 @@ pub const Surface = extern struct {
     /// should be applied to the surface
     fn closureShouldUnfocusedSplitBeShown(
         _: *Self,
+        search_active: c_int,
         focused: c_int,
         is_split: c_int,
     ) callconv(.c) c_int {
-        return @intFromBool(focused == 0 and is_split != 0);
+        return @intFromBool(search_active == 0 and focused == 0 and is_split != 0);
     }
 
     pub fn toggleFullscreen(self: *Self) void {

src/apprt/gtk/ui/1.2/surface.blp

@@ -203,7 +203,7 @@ Overlay terminal_page {
   // Apply unfocused-split-fill and unfocused-split-opacity to current surface
   // this is only applied when a tab has more than one surface
   Revealer {
-    reveal-child: bind $should_unfocused_split_be_shown(template.focused, template.is-split) as <bool>;
+    reveal-child: bind $should_unfocused_split_be_shown(search_overlay.active, template.focused, template.is-split) as <bool>;
     transition-duration: 0;
     // This is all necessary so that the Revealer itself doesn't override
     // any input events from the other overlays. Namely, if you don't have