Auto merge of #26011 - paulrouget:vslog.submods, r=jdm

UWP: include submodule logs

<!-- Please describe your changes on the following line: -->

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #25997 (GitHub issue number if applicable)

ports/libsimpleservo/capi/src/vslogger.rs

@@ -18,9 +18,11 @@ pub struct VSLogger;
 impl log::Log for VSLogger {
     fn enabled(&self, metadata: &Metadata) -> bool {
         let modules = LOG_MODULE_FILTERS.lock().unwrap();
-        let is_module_enabled =
+        modules.is_empty() ||
-            modules.contains(&String::from(metadata.target())) || modules.is_empty();
+            modules.iter().any(|module| {
-        return is_module_enabled;
+                metadata.target() == module ||
+                    metadata.target().starts_with(&format!("{}::", module))
+            })
     }
 
     fn log(&self, record: &Record) {

support/hololens/ServoApp/ServoControl/Servo.cpp

@@ -107,26 +107,22 @@ Servo::Servo(hstring url, hstring args, GLsizei width, GLsizei height,
   o.enable_subpixel_text_antialiasing = false;
   o.vr_pointer = NULL;
 
-  // 7 filter modules.
+  // Note about logs:
-  /* Sample list of servo modules to filter.
+  // By default: all modules are enabled. Only warn level-logs are displayed.
-  static char *pfilters[] = {
+  // To change the log level, add "--vslogger-level debug" to o.args.
-          "servo",
+  // To only print logs from specific modules, add their names to pfilters.
-          "simpleservo",
+  // For example:
-          "simpleservo::jniapi",
+  // static char *pfilters[] = {
-          "simpleservo::gl_glue::egl",
+  //   "servo",
-          // Show JS errors by default.
+  //   "simpleservo",
-          "script::dom::bindings::error",
+  //   "script::dom::bindings::error", // Show JS errors by default.
-          // Show GL errors by default.
+  //   "canvas::webgl_thread", // Show GL errors by default.
-          "canvas::webgl_thread",
+  //   "compositing",
-          "compositing::compositor",
+  //   "constellation",
-          "constellation::constellation",
+  // };
-  };
+  // o.vslogger_mod_list = pfilters;
-  */
+  // o.vslogger_mod_size = sizeof(pfilters) / sizeof(pfilters[0]);
 
-  // Example Call when *pfilters[] is used:
-  // o.vslogger_mod_list = pfilters; // servo log modules
-  // o.vslogger_mod_size = sizeof(pfilters) / sizeof(pfilters[0]); //
-  // Important: Number of modules in pfilters
   o.vslogger_mod_list = NULL;
   o.vslogger_mod_size = 0;