Fix selection when workspace name collides

This can happen if multiple users are using the same name for their
workspaces.

Turns out we can just match the workspace ID.

It hardly seems worth a test to see that a == is working, so I did not
bother to update it.

src/main/kotlin/com/coder/gateway/models/WorkspaceAgentListModel.kt

@@ -16,6 +16,7 @@ data class WorkspaceAgentListModel(
     var icon: Icon? = null,
     // The combined status of the workspace and agent to display on the row.
     val status: WorkspaceAndAgentStatus = WorkspaceAndAgentStatus.from(workspace, agent),
-    // The combined `workspace.agent` name to display on the row.
+    // The combined `workspace.agent` name to display on the row.  Users can have workspaces with the same name, so it
+    // must not be used as a unique identifier.
     val name: String = if (agent != null) "${workspace.name}.${agent.name}" else workspace.name,
 )

src/main/kotlin/com/coder/gateway/views/steps/CoderWorkspacesStepView.kt

@@ -989,17 +989,19 @@ class WorkspacesTable : TableView<WorkspaceAgentListModel>(WorkspacesTableModel(
         }
     }
 
-    fun getNewSelection(oldSelection: WorkspaceAgentListModel?): Int {
+    /**
+     * If a row becomes unselected because the workspace turned on, find the
+     * first agent row and select that.
+     *
+     * If a row becomes unselected because the workspace turned off, find the
+     * workspace row and select that.
+     */
+    private fun getNewSelection(oldSelection: WorkspaceAgentListModel?): Int {
         if (oldSelection == null) {
             return -1
         }
-        val index = listTableModel.items.indexOfFirst { it.name == oldSelection.name }
-        if (index > -1) {
-            return index
-        }
-        // If there is no matching agent, try matching on just the workspace.
-        // It is possible it turned off so it no longer has agents displaying;
-        // in this case we want to keep it highlighted.
-        return listTableModel.items.indexOfFirst { it.workspace.name == oldSelection.workspace.name }
+        // Both cases are handled by just looking for the ID, since we only ever
+        // show agents or a workspace but never both.
+        return listTableModel.items.indexOfFirst { it.workspace.id == oldSelection.workspace.id }
     }
 }