Merge branch 'develop' into pr/rhysd/4359

* develop: (37 commits)
  fix: Arrow markers in flowchart-elk
  Bump version
  chore: Fix type in 'getLineFunctionsWithOffset'
  Update cypress/platform/marker_unique_id.html
  refactor: Add getLineFunctionsWithOffset function
  refactor: Move EdgeData to types
  fix: PointStart marker refX
  Added cypress test
  chore(deps): update all patch dependencies
  refactor: Fix typings in utils.ts
  Give markers unique id's per graph
  chore: Add @internal to createCSSStyles
  chore: Bump version
  refactor: Remove unused variables
  fix: #4818 support `getClasses` in external diagrams.
  Remove unnecessary tests
  Remove optional chaining
  chore: Update docs
  refactor: Use `||` instead of `??`
  Update flowchart.md (#4798)
  ...

cypress/integration/rendering/gantt.spec.js

@@ -330,6 +330,48 @@ describe('Gantt diagram', () => {
     );
   });
 
+  it('should render a gantt diagram with tick is 2 milliseconds', () => {
+    imgSnapshotTest(
+      `
+      gantt
+        title A Gantt Diagram
+        dateFormat   SSS
+        axisFormat   %Lms
+        tickInterval 2millisecond
+        excludes     weekends
+
+        section Section
+        A task           : a1, 000, 6ms
+        Another task     : after a1, 6ms
+        section Another
+        Task in sec      : a2, 006, 3ms
+        another task     : 3ms
+      `,
+      {}
+    );
+  });
+
+  it('should render a gantt diagram with tick is 2 seconds', () => {
+    imgSnapshotTest(
+      `
+      gantt
+        title A Gantt Diagram
+        dateFormat   ss
+        axisFormat   %Ss
+        tickInterval 2second
+        excludes     weekends
+
+        section Section
+        A task           : a1, 00, 6s
+        Another task     : after a1, 6s
+        section Another
+        Task in sec      : 06, 3s
+        another task     : 3s
+      `,
+      {}
+    );
+  });
+
   it('should render a gantt diagram with tick is 15 minutes', () => {
     imgSnapshotTest(
       `

cypress/integration/rendering/marker_unique_id.spec.js

@@ -0,0 +1,10 @@
+import { urlSnapshotTest } from '../../helpers/util.ts';
+
+describe('Marker Unique IDs Per Diagram', () => {
+  it('should render a blue arrow tip in second digram', () => {
+    urlSnapshotTest('http://localhost:9000/marker_unique_id.html', {
+      logLevel: 1,
+      flowchart: { htmlLabels: false },
+    });
+  });
+});