FIX: Add test and fix for multiple touchscreen input bug.#2434
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Darren-Kelly-Unity wants to merge 2 commits into
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FIX: Add test and fix for multiple touchscreen input bug.#2434Darren-Kelly-Unity wants to merge 2 commits into
Darren-Kelly-Unity wants to merge 2 commits into
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Codecov ReportAll modified and coverable lines are covered by tests ✅ @@ Coverage Diff @@
## develop #2434 +/- ##
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+ Coverage 58.58% 79.01% +20.43%
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Files 738 766 +28
Lines 135831 140369 +4538
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+ Hits 79570 110917 +31347
+ Misses 56261 29452 -26809 Flags with carried forward coverage won't be shown. Click here to find out more.
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Purpose of this PR
Fixes a bug (IN-108611) where an ongoing touch on one physical touchscreen could be incorrectly updated by touch events originating from a second physical touchscreen, when both screens reported the same
touchId. The root cause was that three touch-matching code paths inTouchscreen.csidentified touches bytouchIdalone, ignoringdisplayIndex.Release Notes
[IN-108611] Input System — Bug Fixes
touchId.Functional Testing status
Devices_TouchMoveOnSecondDisplay_DoesNotUpdateTouchOnFirstDisplayadded toTouchscreenMultiDisplayTests.cs, covering the exact failure sequence (twoBeganevents with the sametouchIdon differentdisplayIndexvalues, followed by aMovedfrom one screen verifying the other is untouched).Performance Testing Status
No performance impact. The three changed comparisons each add a single byte comparison (
displayIndex) to an existing conditional — no additional allocations, iterations, or data structure changes.Overall Product Risks
Technical Risk: 1 — Self-contained fix to three closely related conditions in one file. Behaviour change is additive (stricter matching); single-screen setups are entirely unaffected since
displayIndexwill always match itself.Halo Effect: 1 — Could affect any code path relying on
Touchscreenwith multi-display touch input, but the existing behaviour in those paths was already incorrect.Class diagram
Changes analysed from
origin/develop...HEADClass diagram
classDiagram class Touchscreen { «modified» OnStateEvent() «modified» GetCurrentValueAsObject() «modified» MergeForward() }