Gutter Icon is Displayed Twice (Duplicate Rendering Issue)

IntelliJ Platform
1

I’m implementing a feature that shows a gutter icon for file navigation on the top-level child elements of a file.

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However, when I open a file in the editor while keeping the source preview pane (e.g. from the search window) open, the gutter icon gets displayed twice.

It seems like the LineMarkerProvider is being triggered in both the editor and the preview pane, causing the icon to appear twice.

Is there any recommended way to detect and prevent this kind of duplicate gutter rendering? For example, by checking whether the same gutter icon is already shown before adding it again?

Below is the implementation of the gutter icon logic where the issue occurs.
SqlLineMakerProvider.kt

I have also tried avoiding duplicate gutter icons by checking the highlighting information associated with the file document, as shown below.
However, this approach doesn’t seem to work reliably.

      val doc = e.containingFile.viewProvider.document

        val identifier = e.firstChild ?: return
        val daoFile = findDaoFile(project, file) ?: return
        val daoMethod = findDaoMethod(e.containingFile, daoFile) ?: return
        val modelEx = DocumentMarkupModel.forDocument(doc, project, false) as MarkupModelEx

        val icon = getIcon(daoFile.toPsiFile(project))
        val tooltip = getToolTipTitle(daoFile.toPsiFile(project))
        val allHighlighters = modelEx.allHighlighters
        val alreadyExists =
            allHighlighters.any { highlighter ->
                val renderer = highlighter.gutterIconRenderer
                highlighter.document == doc &&
                    renderer != null &&
                    renderer.icon == icon &&
                    renderer.isNavigateAction == true &&
                    renderer.tooltipText?.contains(tooltip("")) == true
            }

        if (alreadyExists && allHighlighters.size > 1)return

Thank you.