Camera: Don't drop preview buffers during video

In case the camera device supports ZSL, avoid dropping
preview buffers while video recording is active. Preview
must not get interrupted in this case.

Bug: 117640175
Test: Manual using application, Camera CTS
Change-Id: I9021b4c46428e008298ddef0a86972640b0afa41
Merged-In: I9021b4c46428e008298ddef0a86972640b0afa41
(cherry picked from commit 6c79c9aa7f)

services/camera/libcameraservice/api1/client2/CaptureSequencer.cpp

@@ -553,9 +553,11 @@ CaptureSequencer::CaptureState CaptureSequencer::manageStandardCapture(
         return DONE;
     }
 
-    if (l.mParameters.isDeviceZslSupported) {
+    if ((l.mParameters.isDeviceZslSupported) && (l.mParameters.state != Parameters::RECORD) &&
+            (l.mParameters.state != Parameters::VIDEO_SNAPSHOT)) {
         // If device ZSL is supported, drop all pending preview buffers to reduce the chance of
         // rendering preview frames newer than the still frame.
+        // Additionally, preview must not get interrupted during video recording.
         client->getCameraDevice()->dropStreamBuffers(true, client->getPreviewStreamId());
     }