plugin: align provideTasks

The commit updates the `provideTasks` (ext side) to omit the
cancellation token which is not present in vscode, and instead pass it
when directly calling the method from the task provider adpater.

Signed-off-by: vince-fugnitto <vincent.fugnitto@ericsson.com>

Author: vince-fugnitto

packages/plugin-ext/src/common/plugin-api-rpc.ts

@@ -1773,7 +1773,7 @@ export const MAIN_RPC_CONTEXT = {
 };
 
 export interface TasksExt {
-    $provideTasks(handle: number, token?: CancellationToken): Promise<TaskDto[] | undefined>;
+    $provideTasks(handle: number): Promise<TaskDto[] | undefined>;
     $resolveTask(handle: number, task: TaskDto, token?: CancellationToken): Promise<TaskDto | undefined>;
     $onDidStartTask(execution: TaskExecutionDto, terminalId: number): void;
     $onDidEndTask(id: number): void;

packages/plugin-ext/src/plugin/tasks/tasks.ts

@@ -29,6 +29,7 @@ import { TaskProviderAdapter } from './task-provider';
 import { Emitter, Event } from '@theia/core/lib/common/event';
 import { TerminalServiceExtImpl } from '../terminal-ext';
 import { UUID } from '@theia/core/shared/@phosphor/coreutils';
+import { CancellationToken } from '@theia/core/lib/common/cancellation';
 
 type ExecutionCallback = (resolvedDefinition: theia.TaskDefinition) => Thenable<theia.Pseudoterminal>;
 export class TasksExtImpl implements TasksExt {
@@ -164,10 +165,10 @@ export class TasksExtImpl implements TasksExt {
         throw new Error('Task was not successfully transformed into a task config');
     }
 
-    $provideTasks(handle: number, token: theia.CancellationToken): Promise<TaskDto[] | undefined> {
+    $provideTasks(handle: number): Promise<TaskDto[] | undefined> {
         const adapter = this.adaptersMap.get(handle);
         if (adapter) {
-            return adapter.provideTasks(token).then(tasks => {
+            return adapter.provideTasks(CancellationToken.None).then(tasks => {
                 if (tasks) {
                     for (const task of tasks) {
                         if (task.taskType === 'customExecution') {