Consistent paths in watcher

Fixes #2040

Change the path handling for watcher, now all internal paths should be absolute and chokidar paths will be converted to absolute before handling.

lib/watcher.js

@@ -162,7 +162,7 @@ class Watcher {
 		}).on('all', (event, path) => {
 			if (event === 'add' || event === 'change' || event === 'unlink') {
 				debug('Detected %s of %s', event, path);
-				this.dirtyStates[path] = event;
+				this.dirtyStates[nodePath.join(this.globs.cwd, path)] = event;
 				this.debouncer.debounce();
 			}
 		});
@@ -180,7 +180,7 @@ class Watcher {
 				const dependencies = evt.dependencies.map(x => relative(x)).filter(filePath => {
 					const {isHelper, isSource} = globs.classify(filePath, this.globs);
 					return isHelper || isSource;
-				});
+				}).map(x => nodePath.join(this.globs.cwd, x));
 				this.updateTestDependencies(evt.testFile, dependencies);
 			});
 		});
@@ -215,7 +215,7 @@ class Watcher {
 				}
 
 				for (const file of evt.files) {
-					this.touchedFiles.add(nodePath.relative(process.cwd(), file));
+					this.touchedFiles.add(file);
 				}
 			});
 		});