Increase filematch threshold

Author: martinRenou

ui-tests/tests/ipympl.test.ts

@@ -52,7 +52,8 @@ const testCellOutputs = async (
 
         for (let c = 0; c < numCellImages; ++c) {
             expect(results[c]).toMatchSnapshot(
-                getCaptureImageName(notebook, c)
+                getCaptureImageName(notebook, c),
+                { threshold: 0.3 }
             );
         }
 
@@ -94,7 +95,8 @@ const testUpdates = async (page: IJupyterLabPageFixture, tmpPath: string) => {
 
         for (let i = 0; i < cellCount; i++) {
             expect(results[i]).toMatchSnapshot(
-                getCaptureImageName(notebook, i)
+                getCaptureImageName(notebook, i),
+                { threshold: 0.3 }
             );
         }