diff --git a/src/display_buffer.hh b/src/display_buffer.hh
index 3955ec25..e86dcdb0 100644
--- a/src/display_buffer.hh
+++ b/src/display_buffer.hh
@@ -4,6 +4,7 @@
 #include "face.hh"
 #include "hash.hh"
 #include "coord.hh"
+#include "range.hh"
 #include "string.hh"
 #include "vector.hh"
 #include "hash_map.hh"
@@ -12,18 +13,7 @@ namespace Kakoune
 {
 
 class Buffer;
-struct BufferRange{ BufferCoord begin, end; };
-
-inline bool operator==(const BufferRange& lhs, const BufferRange& rhs)
-{
-    return lhs.begin == rhs.begin and lhs.end == rhs.end;
-}
-
-inline
-size_t hash_value(const BufferRange& range)
-{
-    return hash_values(range.begin, range.end);
-}
+using BufferRange = Range<BufferCoord>;
 
 class BufferIterator;
 // Return a buffer iterator to the coord, tolerating one past end of line coords
diff --git a/src/highlighters.cc b/src/highlighters.cc
index bcc526f3..dbc7e8eb 100644
--- a/src/highlighters.cc
+++ b/src/highlighters.cc
@@ -1638,21 +1638,6 @@ struct RegexMatch
 };
 
 using RegexMatchList = Vector<RegexMatch, MemoryDomain::Regions>;
-struct LineRange
-{
-    LineCount begin;
-    LineCount end;
-
-    friend bool operator==(LineRange lhs, LineRange rhs)
-    {
-        return lhs.begin == rhs.begin and lhs.end == rhs.end;
-    }
-    friend bool operator!=(LineRange lhs, LineRange rhs)
-    {
-        return not (lhs == rhs);
-    }
-};
-
 void append_matches(const Buffer& buffer, LineCount line, RegexMatchList& matches, const Regex& regex, bool capture)
 {
     auto l = buffer[line];
@@ -1772,123 +1757,6 @@ struct RegionMatches : UseMemoryDomain<MemoryDomain::Highlight>
     }
 };
 
-struct LineRangeSet : private Vector<LineRange, MemoryDomain::Highlight>
-{
-    using Base = Vector<LineRange, MemoryDomain::Highlight>;
-    using Base::operator[];
-    using Base::begin;
-    using Base::end;
-
-    ConstArrayView<LineRange> view() const { return {data(), data() + size()}; }
-
-    void reset(LineRange range) { Base::operator=({range}); }
-
-    void update(ConstArrayView<LineModification> modifs)
-    {
-        if (modifs.empty())
-            return;
-
-        for (auto it = begin(); it != end(); ++it)
-        {
-            auto modif_beg = std::lower_bound(modifs.begin(), modifs.end(), it->begin,
-                                              [](const LineModification& c, const LineCount& l)
-                                              { return c.old_line + c.num_removed < l; });
-            auto modif_end = std::upper_bound(modifs.begin(), modifs.end(), it->end,
-                                              [](const LineCount& l, const LineModification& c)
-                                              { return l < c.old_line; });
-
-            if (modif_beg == modifs.end())
-            {
-                const auto diff = (modif_beg-1)->diff();
-                it->begin += diff;
-                it->end += diff;
-                continue;
-            }
-
-            const auto diff = modif_beg->new_line - modif_beg->old_line;
-            it->begin += diff;
-            it->end += diff;
-
-            while (modif_beg != modif_end)
-            {
-                auto& m = *modif_beg++;
-                if (m.num_removed > 0)
-                {
-                    if (m.new_line < it->begin)
-                        it->begin = std::max(m.new_line, it->begin - m.num_removed);
-                    it->end = std::max(m.new_line, std::max(it->begin, it->end - m.num_removed));
-                }
-                if (m.num_added > 0)
-                {
-                    if (it->begin >= m.new_line)
-                        it->begin += m.num_added;
-                    else
-                    {
-                        it = insert(it, {it->begin, m.new_line}) + 1;
-                        it->begin = m.new_line + m.num_added;
-                    }
-                    it->end += m.num_added;
-                }
-            }
-        };
-        erase(std::remove_if(begin(), end(), [](auto& r) { return r.begin >= r.end; }), end());
-    }
-
-    template<typename Func>
-    void add_range(LineRange range, Func&& func)
-    {
-        auto it = std::lower_bound(begin(), end(), range.begin,
-                                   [](LineRange range, LineCount line) { return range.end < line; });
-        if (it == end() or it->begin > range.end)
-            func(range);
-        else 
-        {
-            auto pos = range.begin;
-            while (it != end() and it->begin <= range.end)
-            {
-                if (pos < it->begin)
-                    func({pos, it->begin});
-
-                range = LineRange{std::min(range.begin, it->begin), std::max(range.end, it->end)};
-                pos = it->end;
-                it = erase(it);
-            }
-            if (pos < range.end)
-                func({pos, range.end});
-        }
-        insert(it, range);
-    }
-
-    void remove_range(LineRange range)
-    {
-        auto inside = [](LineCount line, LineRange range) {
-            return range.begin <= line and line < range.end;
-        };
-
-        auto it = std::lower_bound(begin(), end(), range.begin,
-                                   [](LineRange range, LineCount line) { return range.end < line; });
-        if (it == end() or it->begin > range.end)
-            return;
-        else while (it != end() and it->begin <= range.end)
-        {
-            if (it->begin < range.begin and range.end <= it->end)
-            {
-                it = insert(it, {it->begin, range.begin}) + 1;
-                it->begin = range.end;
-            }
-            if (inside(it->begin, range))
-                it->begin = range.end;
-            if (inside(it->end, range))
-                it->end = range.begin;
-
-            if (it->end <= it->begin)
-                it = erase(it);
-            else
-                ++it;
-        }
-    }
-};
-
 struct RegionsHighlighter : public Highlighter
 {
 public:
@@ -2387,68 +2255,4 @@ void register_highlighters()
           "Define the default region of a regions highlighter" } });
 }
 
-UnitTest test_line_range_set{[]{
-    auto expect = [](ConstArrayView<LineRange> ranges) {
-        return [it = ranges.begin(), end = ranges.end()](LineRange r) mutable {
-            kak_assert(it != end);
-            kak_assert(r == *it++);
-        };
-    };
-
-    {
-        LineRangeSet ranges;
-        ranges.add_range({0, 5}, expect({{0, 5}}));
-        ranges.add_range({10, 15}, expect({{10, 15}}));
-        ranges.add_range({5, 10}, expect({{5, 10}}));
-        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 15}}));
-        ranges.add_range({5, 10}, expect({}));
-        ranges.remove_range({3, 8});
-        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 3}, {8, 15}}));
-    }
-    {
-        LineRangeSet ranges;
-        ranges.add_range({0, 7}, expect({{0, 7}}));
-        ranges.add_range({9, 15}, expect({{9, 15}}));
-        ranges.add_range({5, 10}, expect({{7, 9}}));
-        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 15}}));
-    }
-    {
-        LineRangeSet ranges;
-        ranges.add_range({0, 7}, expect({{0, 7}}));
-        ranges.add_range({11, 15}, expect({{11, 15}}));
-        ranges.add_range({5, 10}, expect({{7, 10}}));
-        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 10}, {11, 15}}));
-        ranges.remove_range({8, 13});
-        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 8}, {13, 15}}));
-    }
-    {
-        LineRangeSet ranges;
-        ranges.add_range({0, 5}, expect({{0, 5}}));
-        ranges.add_range({10, 15}, expect({{10, 15}}));
-        ranges.update(ConstArrayView<LineModification>{{3, 3, 3, 1}, {11, 9, 2, 4}});
-        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 3}, {8, 9}, {13, 15}}));
-    }
-    {
-        LineRangeSet ranges;
-        ranges.add_range({0, 5}, expect({{0, 5}}));
-        ranges.update(ConstArrayView<LineModification>{{2, 2, 2, 0}});
-        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 3}}));
-    }
-    {
-        LineRangeSet ranges;
-        ranges.add_range({0, 5}, expect({{0, 5}}));
-        ranges.update(ConstArrayView<LineModification>{{2, 2, 0, 2}});
-        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 2}, {4, 7}}));
-    }
-    {
-        LineRangeSet ranges;
-        ranges.add_range({0, 1}, expect({{0, 1}}));
-        ranges.add_range({5, 10}, expect({{5, 10}}));
-        ranges.add_range({15, 20}, expect({{15, 20}}));
-        ranges.add_range({25, 30}, expect({{25, 30}}));
-        ranges.update(ConstArrayView<LineModification>{{2, 2, 3, 0}});
-        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 1}, {2, 7}, {12, 17}, {22, 27}}));
-    }
-}};
-
 }
diff --git a/src/line_modification.cc b/src/line_modification.cc
index da3ee87f..30722368 100644
--- a/src/line_modification.cc
+++ b/src/line_modification.cc
@@ -94,6 +94,111 @@ bool operator==(const LineModification& lhs, const LineModification& rhs)
            std::tie(rhs.old_line, rhs.new_line, rhs.num_removed, rhs.num_added);
 }
 
+void LineRangeSet::update(ConstArrayView<LineModification> modifs)
+{
+    if (modifs.empty())
+        return;
+
+    for (auto it = begin(); it != end(); ++it)
+    {
+        auto modif_beg = std::lower_bound(modifs.begin(), modifs.end(), it->begin,
+                                          [](const LineModification& c, const LineCount& l)
+                                          { return c.old_line + c.num_removed < l; });
+        auto modif_end = std::upper_bound(modifs.begin(), modifs.end(), it->end,
+                                          [](const LineCount& l, const LineModification& c)
+                                          { return l < c.old_line; });
+
+        if (modif_beg == modifs.end())
+        {
+            const auto diff = (modif_beg-1)->diff();
+            it->begin += diff;
+            it->end += diff;
+            continue;
+        }
+
+        const auto diff = modif_beg->new_line - modif_beg->old_line;
+        it->begin += diff;
+        it->end += diff;
+
+        while (modif_beg != modif_end)
+        {
+            auto& m = *modif_beg++;
+            if (m.num_removed > 0)
+            {
+                if (m.new_line < it->begin)
+                    it->begin = std::max(m.new_line, it->begin - m.num_removed);
+                it->end = std::max(m.new_line, std::max(it->begin, it->end - m.num_removed));
+            }
+            if (m.num_added > 0)
+            {
+                if (it->begin >= m.new_line)
+                    it->begin += m.num_added;
+                else
+                {
+                    it = insert(it, {it->begin, m.new_line}) + 1;
+                    it->begin = m.new_line + m.num_added;
+                }
+                it->end += m.num_added;
+            }
+        }
+    };
+    erase(std::remove_if(begin(), end(), [](auto& r) { return r.begin >= r.end; }), end());
+}
+
+void LineRangeSet::add_range(LineRange range, std::function<void (LineRange)> on_new_range)
+{
+    auto it = std::lower_bound(begin(), end(), range.begin,
+                               [](LineRange range, LineCount line) { return range.end < line; });
+    if (it == end() or it->begin > range.end)
+        on_new_range(range);
+    else 
+    {
+        auto pos = range.begin;
+        while (it != end() and it->begin <= range.end)
+        {
+            if (pos < it->begin)
+                on_new_range({pos, it->begin});
+
+            range = LineRange{std::min(range.begin, it->begin), std::max(range.end, it->end)};
+            pos = it->end;
+            it = erase(it);
+        }
+        if (pos < range.end)
+            on_new_range({pos, range.end});
+    }
+    insert(it, range);
+}
+
+void LineRangeSet::remove_range(LineRange range)
+{
+    auto inside = [](LineCount line, LineRange range) {
+        return range.begin <= line and line < range.end;
+    };
+
+    auto it = std::lower_bound(begin(), end(), range.begin,
+                               [](LineRange range, LineCount line) { return range.end < line; });
+    if (it == end() or it->begin > range.end)
+        return;
+    else while (it != end() and it->begin <= range.end)
+    {
+        if (it->begin < range.begin and range.end <= it->end)
+        {
+            it = insert(it, {it->begin, range.begin}) + 1;
+            it->begin = range.end;
+        }
+        if (inside(it->begin, range))
+            it->begin = range.end;
+        if (inside(it->end, range))
+            it->end = range.begin;
+
+        if (it->end <= it->begin)
+            it = erase(it);
+        else
+            ++it;
+    }
+}
+
+
 UnitTest test_line_modifications{[]()
 {
     {
@@ -155,4 +260,68 @@ UnitTest test_line_modifications{[]()
     }
 }};
 
+UnitTest test_line_range_set{[]{
+    auto expect = [](ConstArrayView<LineRange> ranges) {
+        return [it = ranges.begin(), end = ranges.end()](LineRange r) mutable {
+            kak_assert(it != end);
+            kak_assert(r == *it++);
+        };
+    };
+
+    {
+        LineRangeSet ranges;
+        ranges.add_range({0, 5}, expect({{0, 5}}));
+        ranges.add_range({10, 15}, expect({{10, 15}}));
+        ranges.add_range({5, 10}, expect({{5, 10}}));
+        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 15}}));
+        ranges.add_range({5, 10}, expect({}));
+        ranges.remove_range({3, 8});
+        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 3}, {8, 15}}));
+    }
+    {
+        LineRangeSet ranges;
+        ranges.add_range({0, 7}, expect({{0, 7}}));
+        ranges.add_range({9, 15}, expect({{9, 15}}));
+        ranges.add_range({5, 10}, expect({{7, 9}}));
+        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 15}}));
+    }
+    {
+        LineRangeSet ranges;
+        ranges.add_range({0, 7}, expect({{0, 7}}));
+        ranges.add_range({11, 15}, expect({{11, 15}}));
+        ranges.add_range({5, 10}, expect({{7, 10}}));
+        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 10}, {11, 15}}));
+        ranges.remove_range({8, 13});
+        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 8}, {13, 15}}));
+    }
+    {
+        LineRangeSet ranges;
+        ranges.add_range({0, 5}, expect({{0, 5}}));
+        ranges.add_range({10, 15}, expect({{10, 15}}));
+        ranges.update(ConstArrayView<LineModification>{{3, 3, 3, 1}, {11, 9, 2, 4}});
+        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 3}, {8, 9}, {13, 15}}));
+    }
+    {
+        LineRangeSet ranges;
+        ranges.add_range({0, 5}, expect({{0, 5}}));
+        ranges.update(ConstArrayView<LineModification>{{2, 2, 2, 0}});
+        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 3}}));
+    }
+    {
+        LineRangeSet ranges;
+        ranges.add_range({0, 5}, expect({{0, 5}}));
+        ranges.update(ConstArrayView<LineModification>{{2, 2, 0, 2}});
+        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 2}, {4, 7}}));
+    }
+    {
+        LineRangeSet ranges;
+        ranges.add_range({0, 1}, expect({{0, 1}}));
+        ranges.add_range({5, 10}, expect({{5, 10}}));
+        ranges.add_range({15, 20}, expect({{15, 20}}));
+        ranges.add_range({25, 30}, expect({{25, 30}}));
+        ranges.update(ConstArrayView<LineModification>{{2, 2, 3, 0}});
+        kak_assert((ranges.view() == ConstArrayView<LineRange>{{0, 1}, {2, 7}, {12, 17}, {22, 27}}));
+    }
+}};
+
 }
diff --git a/src/line_modification.hh b/src/line_modification.hh
index 7c21503c..cdc601df 100644
--- a/src/line_modification.hh
+++ b/src/line_modification.hh
@@ -1,8 +1,10 @@
 #ifndef line_change_watcher_hh_INCLUDED
 #define line_change_watcher_hh_INCLUDED
 
+#include "array_view.hh"
 #include "units.hh"
 #include "utils.hh"
+#include "range.hh"
 #include "vector.hh"
 
 namespace Kakoune
@@ -22,6 +24,25 @@ struct LineModification
 
 Vector<LineModification> compute_line_modifications(const Buffer& buffer, size_t timestamp);
 
+using LineRange = Range<LineCount>;
+
+struct LineRangeSet : private Vector<LineRange, MemoryDomain::Highlight>
+{
+    using Base = Vector<LineRange, MemoryDomain::Highlight>;
+    using Base::operator[];
+    using Base::begin;
+    using Base::end;
+
+    ConstArrayView<LineRange> view() const { return {data(), data() + size()}; }
+
+    void reset(LineRange range) { Base::operator=({range}); }
+
+    void update(ConstArrayView<LineModification> modifs);
+    void add_range(LineRange range, std::function<void (LineRange)> on_new_range);
+    void remove_range(LineRange range);
+};
+
+
 }
 
 #endif // line_change_watcher_hh_INCLUDED
diff --git a/src/range.hh b/src/range.hh
new file mode 100644
index 00000000..eb8be269
--- /dev/null
+++ b/src/range.hh
@@ -0,0 +1,31 @@
+#ifndef range_hh_INCLUDED
+#define range_hh_INCLUDED
+
+namespace Kakoune
+{
+
+template<typename T>
+struct Range
+{
+    T begin;
+    T end;
+
+    friend bool operator==(const Range& lhs, const Range& rhs)
+    {
+        return lhs.begin == rhs.begin and lhs.end == rhs.end;
+    }
+
+    friend bool operator!=(const Range& lhs, const Range& rhs)
+    {
+        return not (lhs == rhs);
+    }
+
+    friend size_t hash_value(const Range& range)
+    {
+        return hash_values(range.begin, range.end);
+    }
+};
+
+}
+
+#endif // range_hh_INCLUDED