# [Bug] Unintended HUD element movement during fast clicking in Deploy Defender #282

New Issue

2026-06-28T16:11:17Z

enjin2310 commented

2026-06-28 16:11:17 +00:00

Summary

In the Deploy Defender game, players can unintentionally move HUD elements while spamming clicks during gameplay. This behavior disrupts the game flow and can lead to losing rounds, especially in advanced levels where rapid clicking is essential for progression.

Issue Description

During gameplay, clicking rapidly on the battlefield sometimes selects and drags interface elements (pipeline stages or HUD components). This causes the UI to shift or move instead of registering defensive actions. The issue stems from the elements being selectable or draggable when they should remain fixed during active play.

Observed Behavior

HUD elements (e.g., “Git Repo”, “Build S.”, “Lint /”, “Unit Te.”, etc.) can be selected and moved.
Fast clicking or dragging triggers unintended UI movement.
The game interprets clicks as selection events instead of attack/defense commands.
This can cause players to lose control during critical moments.

Expected Behavior

HUD elements should remain locked and non-selectable during gameplay.
Clicks should only trigger defensive actions, not UI movement.

Environment

Property	Value
Application	SpikerSoft Learning Platform
Module	Deploy Defender Game
Environment	Production
Browser	Firefox
Operating System	Windows 11
Version	v2026.06.28b
Device	Desktop PC

Steps to Reproduce

Navigate to learn.spikersoft.com/deploy-defender.
Start a game and reach an active level.
Click rapidly on the battlefield to deploy defenses.
Observe that HUD elements can be selected or moved unintentionally.

Expected Result

HUD elements remain static and unselectable during gameplay.

Actual Result

HUD elements can be selected and moved, disrupting gameplay and causing potential losses.

Evidence

Screenshot shows the Deploy Defender interface with selectable pipeline stages visible.
The issue occurs when clicking or dragging near these elements during active play.

Impact

Breaks immersion and gameplay flow.
Causes unintended losses in higher levels.
Reduces playability and user experience.
Considered an unintended behavior in game design.

Frequency

Always

Reproducibility

100%

Severity

Medium

Notes

Locking HUD elements during active gameplay or disabling selection events would prevent this issue.
Alternatively, implementing a click-only mode during active rounds could ensure that all clicks are interpreted as defensive actions.

## Summary In the **Deploy Defender** game, players can unintentionally move HUD elements while spamming clicks during gameplay. This behavior disrupts the game flow and can lead to losing rounds, especially in advanced levels where rapid clicking is essential for progression. ## Issue Description During gameplay, clicking rapidly on the battlefield sometimes selects and drags interface elements (pipeline stages or HUD components). This causes the UI to shift or move instead of registering defensive actions. The issue stems from the elements being selectable or draggable when they should remain fixed during active play. ### Observed Behavior - HUD elements (e.g., “Git Repo”, “Build S.”, “Lint /”, “Unit Te.”, etc.) can be selected and moved. - Fast clicking or dragging triggers unintended UI movement. - The game interprets clicks as selection events instead of attack/defense commands. - This can cause players to lose control during critical moments. ### Expected Behavior HUD elements should remain **locked** and **non-selectable** during gameplay. Clicks should only trigger defensive actions, not UI movement. ## Environment | Property | Value | |-----------|--------| | Application | SpikerSoft Learning Platform | | Module | Deploy Defender Game | | Environment | Production | | Browser | Firefox | | Operating System | Windows 11 | | Version | v2026.06.28b | | Device | Desktop PC | ## Steps to Reproduce 1. Navigate to `learn.spikersoft.com/deploy-defender`. 2. Start a game and reach an active level. 3. Click rapidly on the battlefield to deploy defenses. 4. Observe that HUD elements can be selected or moved unintentionally. ## Expected Result HUD elements remain static and unselectable during gameplay. ## Actual Result HUD elements can be selected and moved, disrupting gameplay and causing potential losses. ## Evidence - Screenshot shows the **Deploy Defender** interface with selectable pipeline stages visible. - The issue occurs when clicking or dragging near these elements during active play. ## Impact - Breaks immersion and gameplay flow. - Causes unintended losses in higher levels. - Reduces playability and user experience. - Considered an **unintended behavior** in game design. ## Frequency Always ## Reproducibility 100% ## Severity Medium ## Notes Locking HUD elements during active gameplay or disabling selection events would prevent this issue. Alternatively, implementing a **click-only mode** during active rounds could ensure that all clicks are interpreted as defensive actions.

Screenshot 2026-06-28 120659.png

359 KiB

spikerj commented

2026-06-30 23:14:44 +00:00

Confirmed and fixed in spikersoft-angular PR #84 (open, not yet merged). Root cause: the game <canvas> had no user-select: none / draggable=false, unlike every other game canvas in the repo (chess, github-sweeper, duality already guard against this). A quick mousedown+move on the canvas during rapid clicking could trigger the browser's native ghost-image drag of the canvas element, which visually shows the currently-rendered pipeline-stage labels appearing to move. Added user-select: none, -webkit-user-drag: none, touch-action: none, and draggable="false" to match the established pattern. Will close once the PR is merged.

Confirmed and fixed in spikersoft-angular PR #84 (open, not yet merged). Root cause: the game `<canvas>` had no `user-select: none` / `draggable=false`, unlike every other game canvas in the repo (chess, github-sweeper, duality already guard against this). A quick mousedown+move on the canvas during rapid clicking could trigger the browser's native ghost-image drag of the canvas element, which visually shows the currently-rendered pipeline-stage labels appearing to move. Added `user-select: none`, `-webkit-user-drag: none`, `touch-action: none`, and `draggable="false"` to match the established pattern. Will close once the PR is merged.

spikerj commented

2026-07-01 01:23:11 +00:00

Resolved in spikersoft-angular PR #84 (merged to master). Root cause: the game <canvas> had no user-select: none / draggable=false, unlike every other game canvas in the repo (chess, github-sweeper, duality already guard against this). A quick mousedown+move on the canvas during rapid clicking could trigger the browser's native ghost-image drag of the canvas element, which visually shows the currently-rendered pipeline-stage labels appearing to move. Added user-select: none, -webkit-user-drag: none, touch-action: none, and draggable="false" to match the established pattern. Closing.

Resolved in spikersoft-angular PR #84 (merged to `master`). Root cause: the game `<canvas>` had no `user-select: none` / `draggable=false`, unlike every other game canvas in the repo (chess, github-sweeper, duality already guard against this). A quick mousedown+move on the canvas during rapid clicking could trigger the browser's native ghost-image drag of the canvas element, which visually shows the currently-rendered pipeline-stage labels appearing to move. Added `user-select: none`, `-webkit-user-drag: none`, `touch-action: none`, and `draggable="false"` to match the established pattern. Closing.

spikerj closed this issue

2026-07-01 01:24:09 +00:00

spikerj referenced this issue

2026-07-14 20:02:48 +00:00

[Bug][Backend][API] CodeExecutionResultConsumer uses autoAck:true — a student's execution result is silently lost if the API dies mid-handle #573

spikerj referenced this issue

2026-07-14 20:24:17 +00:00

[Bug][Backend][API] CodeExecutionResultConsumer uses autoAck:true — a student's execution result is silently lost if the API dies mid-handle #573

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