Use stable_sort to sort media capture devices according the fitness d…

…istance

https://bugs.webkit.org/show_bug.cgi?id=255131
rdar://problem/107735578

Reviewed by Eric Carlson.

Using stable_sort gives more predictive results since the initial order is the one we specify.
Also, it will favor higher priority devices (first in the list) against lower priority devices.

* Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.cpp:
(WebCore::RealtimeMediaSourceCenter::validateRequestConstraintsAfterEnumeration):

Canonical link: https://commits.webkit.org/262718@main

Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.cpp

@@ -332,15 +332,15 @@ void RealtimeMediaSourceCenter::validateRequestConstraintsAfterEnumeration(Valid
 
     Vector<CaptureDevice> audioDevices;
     if (!audioDeviceInfo.isEmpty()) {
-        std::sort(audioDeviceInfo.begin(), audioDeviceInfo.end(), sortBasedOnFitnessScore);
+        std::stable_sort(audioDeviceInfo.begin(), audioDeviceInfo.end(), sortBasedOnFitnessScore);
         audioDevices = WTF::map(audioDeviceInfo, [] (auto& info) {
             return info.device;
         });
     }
 
     Vector<CaptureDevice> videoDevices;
     if (!videoDeviceInfo.isEmpty()) {
-        std::sort(videoDeviceInfo.begin(), videoDeviceInfo.end(), sortBasedOnFitnessScore);
+        std::stable_sort(videoDeviceInfo.begin(), videoDeviceInfo.end(), sortBasedOnFitnessScore);
         videoDevices = WTF::map(videoDeviceInfo, [] (auto& info) {
             return info.device;
         });