source: https://github.com/texstudio-org/texstudio/commit/4cf5c2eb2a8a0353335c0ed6d6be4b3f19c950c3.patch

From 4cf5c2eb2a8a0353335c0ed6d6be4b3f19c950c3 Mon Sep 17 00:00:00 2001
From: "sunderme@gmx.de" <sunderme@gmx.de>
Date: Wed, 9 May 2018 22:41:16 +0200
Subject: [PATCH] fix messed structureview with qt >=5.10

---
 src/latexdocument.cpp | 8 ++++----
 src/latexstructure.h  | 1 -
 2 files changed, 4 insertions(+), 5 deletions(-)

--- src/latexdocument.cpp
+++ src/latexdocument.cpp
@@ -358,8 +358,8 @@ void LatexDocument::patchStructureRemoval(QDocumentLineHandle *dlh)
 		}
 	}
 
-    //emit structureUpdated(this, newSection);
-    emit setHighlightedEntry(newSection);
+    emit structureUpdated(this, newSection);
+    //emit setHighlightedEntry(newSection);
 
 	if (bibTeXFilesNeedsUpdate)
 		emit updateBibTeXFiles();
@@ -1176,8 +1176,8 @@ bool LatexDocument::patchStructure(int linenr, int count, bool recheck)
 			}
 		}
 
-        //emit structureUpdated(this, newSection);
-        emit setHighlightedEntry(newSection);
+        emit structureUpdated(this, newSection);
+        //emit setHighlightedEntry(newSection);
 	}
 	StructureEntry *se;
 	foreach (se, MapOfTodo.values())


--- src/latexstructure.h
+++ src/latexstructure.h
@@ -114,7 +114,6 @@
 	bool getSingleDocMode();
 	void moveDocs(int from, int to);
 
-public slots:
     void setHighlightedEntry(StructureEntry *entry);
 
 private slots: