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github-merge-queue[bot] pushed a commit to branch 
gh-readonly-queue/main/pr-6927-5021bc6f1a96d00cb26aa9c3a82c86fee67da0a9
in repository https://gitbox.apache.org/repos/asf/texera.git

commit 7daf8d78415d5f40fc017678738ce57b137065c5
Author: Prateek Ganigi <[email protected]>
AuthorDate: Wed Aug 12 18:51:52 2026 +0000

    refactor(frontend): make redundant operator border repaints a no-op (#6927)
    
    ### What changes were proposed in this PR?
    
    When an operator is added, its border was painted by two paths - the
    operator-add restore and the validation pass, producing the same color.
    Harmless, but a redundant repaint.
    
    This PR adds a guarded border setter (`paintOperatorBorder`) in
    `JointUIService` that writes `rect.body/stroke` only when the color
    actually changes. Both `changeOperatorColor` and `changeOperatorState`
    route their border write through it, so a repaint with the color the
    border already has becomes a no-op, effectively "painted once" -
    including on the navigation-return (reload) path.
    
    **Deviation from the approach suggested on the issue:** the issue
    suggested dropping the `applyOperatorBorder` call from the operator-add
    handler and letting the validation pass set the border. I kept that call
    and used the guard instead, because `changeOperatorStatistics` already
    paints the border via `changeOperatorState` *without* checking validity.
    Dropping `applyOperatorBorder` would make an invalid operator with a
    cached "completed" status rely on the validation pass firing afterward
    to correct green→red, reintroducing the order-dependent border fragility
    that #5146 removed (and it would break in the edge case where
    `setDynamicSchema` skips its emit because the schema is unchanged). The
    guard reaches the same no-redundant-repaint goal while keeping the
    border validity-correct regardless of event timing.
    
    ### Any related issues, documentation, discussions?
    Part of #5726
    
    ### How was this PR tested?
    
    Unit tests:
    - `JointUIService`: the guarded setter skips the write when the border
    is already the requested color, and writes when it differs.
    - `WorkflowEditorComponent`: added a navigation-return test for a cached
    **Running** operator (orange), alongside the existing completed (green),
    default (gray), invalid (red), and invalid-over-cached-priority cases.
    - Full frontend suite: 3739 passing.
    
    Manual (navigated away from a running workflow and back), border
    restored correctly for:
    - Completed operators → green
    - Running operators → orange
    - Invalid operators → red
    - Valid, not run → default gray
    
    ### Was this PR authored or co-authored using generative AI tooling?
    
    This PR was co-authored using Claude Code (Anthropic Claude Opus 4.7) in
    compliance with ASF.
---
 .../workflow-editor.component.spec.ts               | 19 ++++++++++++++++---
 .../service/joint-ui/joint-ui.service.spec.ts       | 15 +++++++++++++++
 .../workspace/service/joint-ui/joint-ui.service.ts  | 21 +++++++++++++++++----
 3 files changed, 48 insertions(+), 7 deletions(-)

diff --git 
a/frontend/src/app/workspace/component/workflow-editor/workflow-editor.component.spec.ts
 
b/frontend/src/app/workspace/component/workflow-editor/workflow-editor.component.spec.ts
index d2ecfda618..2c8807a9ec 100644
--- 
a/frontend/src/app/workspace/component/workflow-editor/workflow-editor.component.spec.ts
+++ 
b/frontend/src/app/workspace/component/workflow-editor/workflow-editor.component.spec.ts
@@ -887,15 +887,16 @@ describe("WorkflowEditorComponent", () => {
      */
     describe("operator border restoration after navigation", () => {
       let workflowStatusService: WorkflowStatusService;
-      const cachedCompleted = {
+      const cachedStatus = (operatorState: OperatorState) => ({
         [mockScanPredicate.operatorID]: {
-          operatorState: OperatorState.Completed,
+          operatorState,
           aggregatedInputRowCount: 0,
           inputPortMetrics: {},
           aggregatedOutputRowCount: 0,
           outputPortMetrics: {},
         },
-      };
+      });
+      const cachedCompleted = cachedStatus(OperatorState.Completed);
       const getStroke = (operatorID: string): string =>
         component.paper.getModelById(operatorID).attr("rect.body/stroke") as 
string;
 
@@ -913,6 +914,18 @@ describe("WorkflowEditorComponent", () => {
         expect(getStroke(mockScanPredicate.operatorID)).toBe("green");
       });
 
+      it("paints the execution-state stroke (orange) for a valid operator with 
a cached Running status", () => {
+        // Navigation-return with a mid-run operator: the border must be 
restored
+        // to the running color, not the default (see #3614).
+        vi.spyOn(workflowStatusService, 
"getCurrentStatus").mockReturnValue(cachedStatus(OperatorState.Running));
+        vi.spyOn(validationWorkflowService, 
"validateOperator").mockReturnValue({ isValid: true });
+
+        workflowActionService.addOperator(mockScanPredicate, mockPoint);
+        fixture.detectChanges();
+
+        expect(getStroke(mockScanPredicate.operatorID)).toBe("orange");
+      });
+
       it("falls back to the default valid stroke (#CFCFCF) when no cached 
status exists", () => {
         vi.spyOn(workflowStatusService, 
"getCurrentStatus").mockReturnValue({});
         vi.spyOn(validationWorkflowService, 
"validateOperator").mockReturnValue({ isValid: true });
diff --git 
a/frontend/src/app/workspace/service/joint-ui/joint-ui.service.spec.ts 
b/frontend/src/app/workspace/service/joint-ui/joint-ui.service.spec.ts
index d34a9eb2b3..c383e0963d 100644
--- a/frontend/src/app/workspace/service/joint-ui/joint-ui.service.spec.ts
+++ b/frontend/src/app/workspace/service/joint-ui/joint-ui.service.spec.ts
@@ -361,6 +361,21 @@ describe("JointUIService", () => {
       service.changeOperatorColor(paper, "op-1", false);
       expect(attrSpy).toHaveBeenCalledWith("rect.body/stroke", "red");
     });
+    it("skips the write when the border is already the requested color", () => 
{
+      const { paper, attrSpy } = makePaperWithModel();
+      // model reports it is already neutral; the guarded setter must not 
rewrite it
+      attrSpy.mockImplementation((selector: string) => (selector === 
"rect.body/stroke" ? "#CFCFCF" : undefined));
+      const service = new JointUIService(emptyMetadataStub as never);
+      service.changeOperatorColor(paper, "op-1", true);
+      expect(attrSpy).not.toHaveBeenCalledWith("rect.body/stroke", "#CFCFCF");
+    });
+    it("writes the border when the current color differs", () => {
+      const { paper, attrSpy } = makePaperWithModel();
+      attrSpy.mockImplementation((selector: string) => (selector === 
"rect.body/stroke" ? "red" : undefined));
+      const service = new JointUIService(emptyMetadataStub as never);
+      service.changeOperatorColor(paper, "op-1", true);
+      expect(attrSpy).toHaveBeenCalledWith("rect.body/stroke", "#CFCFCF");
+    });
   });
 
   describe("changeOperatorState", () => {
diff --git a/frontend/src/app/workspace/service/joint-ui/joint-ui.service.ts 
b/frontend/src/app/workspace/service/joint-ui/joint-ui.service.ts
index d069a270eb..bb6fbff0f0 100644
--- a/frontend/src/app/workspace/service/joint-ui/joint-ui.service.ts
+++ b/frontend/src/app/workspace/service/joint-ui/joint-ui.service.ts
@@ -491,11 +491,24 @@ export class JointUIService {
    * @param isOperatorValid
    */
   public changeOperatorColor(jointPaper: joint.dia.Paper, operatorID: string, 
isOperatorValid: boolean): void {
-    if (isOperatorValid) {
-      jointPaper.getModelById(operatorID).attr("rect.body/stroke", "#CFCFCF");
-    } else {
-      jointPaper.getModelById(operatorID).attr("rect.body/stroke", "red");
+    this.paintOperatorBorder(jointPaper, operatorID, isOperatorValid ? 
"#CFCFCF" : "red");
+  }
+
+  /**
+   * Sets the operator's border stroke, returning early when it is already that
+   * color. A same-value attr() write would not re-render (Backbone's Model.set
+   * no-ops via _.isEqual), but attr() still deep-clones and deep-compares the
+   * whole attrs tree before reaching that check. On operator add the 
validation
+   * pass and the operator-add restore both request a border color for the same
+   * operator, so returning early here skips that clone/compare on the second
+   * call.
+   */
+  private paintOperatorBorder(jointPaper: joint.dia.Paper, operatorID: string, 
color: string): void {
+    const model = jointPaper.getModelById(operatorID);
+    if (model.attr("rect.body/stroke") === color) {
+      return;
     }
+    model.attr("rect.body/stroke", color);
   }
 
   public changeOperatorDisableStatus(jointPaper: joint.dia.Paper, operator: 
OperatorPredicate): void {

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