added comment on why reset state only if res is modified (#634)

Signed-off-by: Andre Dietisheim <[email protected]>

Author: adietish

Diff for: src/main/kotlin/com/redhat/devtools/intellij/kubernetes/editor/EditorResource.kt

@@ -57,14 +57,19 @@ open class EditorResource(
      * @see [areEqual]
      * @see [isSameResource]
      * @see [setState]
+     * @see [getState]
      */
     fun setResource(new: HasMetadata) {
         resourceChangeMutex.withLock {
             val existing = this.resource
             if (new.isSameResource(existing)
                 && !areEqual(new, existing)) {
                 this.resource = new
-                setState(null) // reset state
+                /**
+                 * only reset state if resource is modified
+                 * to preserve existing error, pushed/pulled state
+                 */
+                setState(null)
             }
         }
     }