Only update UI when there's been a change in conflict detection (#2054)

## Description

After #1991, the program state was always resent in an attempt to
simplify logic, but this had the side effect of causing the settings UI
to reset periodically when the hostname check was performed. This
restores the original logic in #1791 to check for differences in the
conflict state, and to only send the program state if it's changed.

## Meta

Merge checklist:
- [x] Pull Request title is [short, imperative
summary](https://cbea.ms/git-commit/) of proposed changes
- [x] The description documents the _what_ and _why_
- [ ] If this PR changes behavior or adds a feature, user documentation
is updated
- [ ] If this PR touches photon-serde, all messages have been
regenerated and hashes have not changed unexpectedly
- [ ] If this PR touches configuration, this is backwards compatible
with settings back to v2024.3.1
- [ ] If this PR touches pipeline settings or anything related to data
exchange, the frontend typing is updated
- [ ] If this PR addresses a bug, a regression test for it is added

Author: Gold856

photon-core/src/main/java/org/photonvision/common/dataflow/networktables/NetworkTablesManager.java

@@ -300,20 +300,21 @@ private void checkHostnameAndCameraNames() {
             }
         }
 
-        // Publish the conflict status
-        DataChangeService.getInstance()
-                .publishEvent(
-                        new OutgoingUIEvent<>(
-                                "fullsettings",
-                                UIPhotonConfiguration.programStateToUi(ConfigManager.getInstance().getConfig())));
-
-        conflictAlert.setText(
-                conflictingHostname
-                        ? "Hostname conflict detected for " + hostname + "!"
-                        : ""
-                                + (conflictingCameras.isEmpty()
-                                        ? ""
-                                        : " Camera name conflict detected: " + conflictingCameras.toString() + "!"));
+        if (conflictingHostname != this.conflictingHostname
+                || !conflictingCameras.toString().equals(this.conflictingCameras)) {
+            // Only publish the conflict status when it's changed to prevent the settings cards from being
+            // forcibly reset
+            DataChangeService.getInstance()
+                    .publishEvent(
+                            new OutgoingUIEvent<>(
+                                    "fullsettings",
+                                    UIPhotonConfiguration.programStateToUi(ConfigManager.getInstance().getConfig())));
+        }
+        if (conflictingHostname) {
+            conflictAlert.setText("Hostname conflict detected for " + hostname + "!");
+        } else if (!conflictingCameras.isEmpty()) {
+            conflictAlert.setText("Camera name conflict detected: " + conflictingCameras + "!");
+        }
         conflictAlert.set(conflictingHostname || !conflictingCameras.isEmpty());
         SmartDashboard.updateValues();
         this.conflictingHostname = conflictingHostname;