disable redrawing when setting visible region to prevent flickering #3457
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iloveeclipse
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Oct 30, 2025
iloveeclipse
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Oct 30, 2025
...eclipse.jface.text/projection/org/eclipse/jface/text/source/projection/ProjectionViewer.java
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When
setVisibleRegionis repeatedly called with projection regions enabled, it first expands everything outside of the old visible region and then collapses everything inside the new visible region. This can result in Eclipse showing unwanted text for a fraction of a second.Without this change:
Screencast_20251026_113947.webm
With this change:
Screencast_20251026_114117.webm
(I made the recordings with eclipse-jdt/eclipse.jdt.ui#2302 active to get the visible regions logic in JDT)
I don't think an automated test is reasonable for this but I can try to provide a way to reproduce this manually without JDT if necessary.