diff --git a/docs/coverage.md b/docs/coverage.md
index 5d1884d..8f1773e 100644
--- a/docs/coverage.md
+++ b/docs/coverage.md
@@ -43,7 +43,7 @@ when one is missing.
 <!-- BEGIN GENERATED: tools/coverage.sh -->
 
 ```
-coverage_floor: ok -- 23 files under src/, aggregate 95.3% lines (3284/3447), every file at or above 80%, aggregate target 90%
+coverage_floor: ok -- 23 files under src/, aggregate 95.2% lines (3302/3469), every file at or above 80%, aggregate target 90%
 ```
 
 | File | Lines | Line rate | Functions |
@@ -54,24 +54,24 @@ coverage_floor: ok -- 23 files under src/, aggregate 95.3% lines (3284/3447), ev
 | `src/data/stream_series.cpp` | 39/39 | 100.0% | 100.0% |
 | `src/gl/handle.cpp` | 256/256 | 100.0% | 100.0% |
 | `src/gl/loader.cpp` | 81/81 | 100.0% | 100.0% |
-| `src/input/controller.cpp` | 327/341 | 95.9% | 100.0% |
+| `src/input/controller.cpp` | 329/343 | 95.9% | 100.0% |
 | `src/math/transform.cpp` | 28/28 | 100.0% | 100.0% |
 | `src/plot/axis.cpp` | 12/12 | 100.0% | 100.0% |
-| `src/plot/figure.cpp` | 213/218 | 97.7% | 95.5% |
+| `src/plot/figure.cpp` | 218/223 | 97.8% | 95.5% |
 | `src/plot/grid.cpp` | 15/16 | 93.8% | 100.0% |
 | `src/plot/measure.cpp` | 21/21 | 100.0% | 100.0% |
-| `src/plot/plot.cpp` | 733/753 | 97.3% | 98.9% |
+| `src/plot/plot.cpp` | 743/763 | 97.4% | 98.9% |
 | `src/plot/ticks.cpp` | 93/99 | 93.9% | 100.0% |
 | `src/render/buffer.cpp` | 88/98 | 89.8% | 100.0% |
 | `src/render/embedded_mono_font.cpp` | 45/45 | 100.0% | 100.0% |
 | `src/render/primitives.cpp` | 71/75 | 94.7% | 100.0% |
 | `src/render/program.cpp` | 26/27 | 96.3% | 100.0% |
-| `src/render/renderer.cpp` | 529/604 | 87.6% | 93.7% |
+| `src/render/renderer.cpp` | 530/609 | 87.0% | 93.7% |
 | `src/render/text.cpp` | 27/30 | 90.0% | 100.0% |
 | `src/render/text_atlas.cpp` | 40/41 | 97.6% | 100.0% |
 | `src/render/vertex_array.cpp` | 59/59 | 100.0% | 100.0% |
 | `src/text/true_type_font.cpp` | 270/291 | 92.8% | 96.8% |
-| **src/ aggregate** | **3284/3447** | **95.3%** | **98.3%** |
+| **src/ aggregate** | **3302/3469** | **95.2%** | **98.3%** |
 
 <!-- END GENERATED: tools/coverage.sh -->
 
diff --git a/tests/test_plot.cpp b/tests/test_plot.cpp
index 9dd80d6..58841b1 100644
--- a/tests/test_plot.cpp
+++ b/tests/test_plot.cpp
@@ -1787,6 +1787,41 @@ PLOT_TEST(removing_a_region_shifts_the_ids_and_keeps_the_statistics) {
   PLOT_CHECK(!p.region_stats(9u, tr).valid);
 }
 
+/// The published hot handles name a region by the same index the vector does, so a
+/// removal has to re-index them with the rest: a frame drawn before the next pointer event
+/// reads `hot_handles()`, and one left naming the old index would highlight the wrong
+/// region's bound -- and an open drag would edit a different region. The handle on the
+/// removed region is cleared with its zone; one naming a region above the hole follows it
+/// down.
+PLOT_TEST(removing_a_region_reindexes_the_published_hot_handles) {
+  plot::Plot p;
+  p.set_viewport({0.0f, 0.0f, 800.0f, 400.0f});
+  p.add_x_axis({"t", {0.0, 99.0}, false, plot::AxisPlace::Bottom, false});
+  p.add_y_axis({"v", {0.0, 99.0}, false, plot::AxisPlace::Left, false});
+  plot::Region bounds;
+  bounds.snap = plot::RegionSnap::Free;
+  PLOT_CHECK(p.add_region(bounds) == 0u);
+  PLOT_CHECK(p.add_region(bounds) == 1u);
+  PLOT_CHECK(p.add_region(bounds) == 2u);
+
+  // A handle on the last region, with the hole below it: it follows the region down.
+  plot::HotHandles hot;
+  hot.region = 2u;
+  hot.zone = plot::RegionGrab::Right;
+  p.set_hot_handles(hot);
+  p.remove_region(0u);
+  PLOT_CHECK(p.hot_handles().region == 1u);
+  PLOT_CHECK(p.hot_handles().zone == plot::RegionGrab::Right);
+
+  // A handle on the region that is removed: it is cleared, zone and all.
+  hot.region = 0u;
+  hot.zone = plot::RegionGrab::Left;
+  p.set_hot_handles(hot);
+  p.remove_region(0u);
+  PLOT_CHECK(p.hot_handles().region == plot::kInvalid);
+  PLOT_CHECK(p.hot_handles().zone == plot::RegionGrab::None);
+}
+
 /// A bound that is not a number is not a bound. `std::min`/`std::max` propagate a NaN
 /// through *both* ends of the pair, so accepting one would not merely invert the interval:
 /// it would replace the finite partner too, and a `Free` region stored that way could never