Use the much faster forOutliner also to get the tooltip text.

src/Paragraph.cpp

@@ -3269,8 +3269,6 @@ void Paragraph::forOutliner(docstring & os, size_t const maxlen,
 		char_type const c = d->text_[i];
 		if (isPrintable(c))
 			os += c;
-		else if (c == '\t' || c == '\n')
-			os += ' ';
 		else if (c == META_INSET)
 			getInset(i)->forOutliner(os, tmplen, false);
 	}

src/insets/Inset.h

@@ -74,7 +74,7 @@ std::string insetName(InsetCode);
 /// Eg, insetDisplayName(BRANCH_CODE) == _("Branch")
 docstring insetDisplayName(InsetCode);
 ///
-static int const TOC_ENTRY_LENGTH = 128;
+static int const TOC_ENTRY_LENGTH = 120;
 
 /// Common base class to all insets
 

src/insets/InsetBranch.cpp

@@ -357,10 +357,14 @@ void InsetBranch::addToToc(DocIterator const & cpit, bool output_active,
 	DocIterator pit = cpit;
 	pit.push_back(CursorSlice(const_cast<InsetBranch &>(*this)));
 	
+	docstring tooltip;
+	text().forOutliner(tooltip, TOC_ENTRY_LENGTH);
+	docstring str = params_.branch + ": " + tooltip;
+	tooltip = support::wrapParas(tooltip, 0, 60, 2);
+	
 	shared_ptr<Toc> toc = buffer().tocBackend().toc("branch");
-	docstring str = params_.branch + ": ";
+	toc->push_back(TocItem(pit, 0, str, output_active, tooltip));
-	text().forOutliner(str, TOC_ENTRY_LENGTH);
+	
-	toc->push_back(TocItem(pit, 0, str, output_active, toolTipText(docstring(), 3, 60)));
 	// Proceed with the rest of the inset.
 	bool const doing_output = output_active && isBranchSelected();
 	InsetCollapsable::addToToc(cpit, doing_output, utype);

src/insets/InsetFoot.cpp

@@ -26,6 +26,7 @@
 #include "support/debug.h"
 #include "support/docstream.h"
 #include "support/gettext.h"
+#include "support/lstrings.h"
 
 using namespace std;
 
@@ -80,10 +81,14 @@ void InsetFoot::addToToc(DocIterator const & cpit, bool output_active,
 	DocIterator pit = cpit;
 	pit.push_back(CursorSlice(const_cast<InsetFoot &>(*this)));
 	
+	docstring tooltip;
+	text().forOutliner(tooltip, TOC_ENTRY_LENGTH);
+	docstring str = custom_label_ + ": " + tooltip;
+	tooltip = support::wrapParas(tooltip, 0, 60, 2);
+	
 	shared_ptr<Toc> toc = buffer().tocBackend().toc("footnote");
-	docstring str = custom_label_ + ": ";
+	toc->push_back(TocItem(pit, 0, str, output_active, tooltip));
-	text().forOutliner(str, TOC_ENTRY_LENGTH);
+	
-	toc->push_back(TocItem(pit, 0, str, output_active, toolTipText(docstring(), 3, 60)));
 	// Proceed with the rest of the inset.
 	InsetFootlike::addToToc(cpit, output_active, utype);
 }

src/insets/InsetMarginal.cpp

@@ -20,6 +20,7 @@
 
 #include "support/docstream.h"
 #include "support/gettext.h"
+#include "support/lstrings.h"
 
 namespace lyx {
 
@@ -57,10 +58,14 @@ void InsetMarginal::addToToc(DocIterator const & cpit, bool output_active,
 	DocIterator pit = cpit;
 	pit.push_back(CursorSlice(const_cast<InsetMarginal &>(*this)));
 
+	docstring tooltip;
+	text().forOutliner(tooltip, TOC_ENTRY_LENGTH);
+	docstring const str = tooltip;
+	tooltip = support::wrapParas(tooltip, 0, 60, 2);
+	
 	shared_ptr<Toc> toc = buffer().tocBackend().toc("marginalnote");
-	docstring str;
+	toc->push_back(TocItem(pit, 0, str, output_active, tooltip));
-	text().forOutliner(str, TOC_ENTRY_LENGTH);
+
-	toc->push_back(TocItem(pit, 0, str, output_active, toolTipText(docstring(), 3, 60)));
 	// Proceed with the rest of the inset.
 	InsetFootlike::addToToc(cpit, output_active, utype);
 }

src/insets/InsetNote.cpp

@@ -37,6 +37,7 @@
 #include "support/debug.h"
 #include "support/docstream.h"
 #include "support/gettext.h"
+#include "support/lstrings.h"
 #include "support/Translator.h"
 
 #include "frontends/Application.h"
@@ -213,11 +214,14 @@ void InsetNote::addToToc(DocIterator const & cpit, bool output_active,
 	DocIterator pit = cpit;
 	pit.push_back(CursorSlice(const_cast<InsetNote &>(*this)));
 	
-	shared_ptr<Toc> toc = buffer().tocBackend().toc("note");
 	InsetLayout const & il = getLayout();
-	docstring str = translateIfPossible(il.labelstring()) + from_ascii(": ");
+	docstring tooltip;
-	text().forOutliner(str, TOC_ENTRY_LENGTH);
+	text().forOutliner(tooltip, TOC_ENTRY_LENGTH);
-	toc->push_back(TocItem(pit, 0, str, output_active, toolTipText(docstring(), 3, 60)));
+	docstring str = translateIfPossible(il.labelstring()) + ": " + tooltip;
+	tooltip = support::wrapParas(tooltip, 0, 60, 2);
+	
+	shared_ptr<Toc> toc = buffer().tocBackend().toc("note");
+	toc->push_back(TocItem(pit, 0, str, output_active, tooltip));
 
 	// Proceed with the rest of the inset.
 	bool doing_output = output_active && producesOutput();

src/insets/InsetText.h

@@ -201,6 +201,9 @@ public:
 	/// e.g., "Index: ".
 	/// \param numlines: the number of lines in the tooltip
 	/// \param len: length of those lines
+	/// NOTE This routine is kind of slow. It's fine to use it within the 
+	/// GUI, but definitely do not try to use it in updateBuffer or anything
+	/// of that sort.
 	docstring toolTipText(docstring prefix = empty_docstring(),
 			size_t numlines = 5, size_t len = 80) const;