diff --git a/.woodpecker.yaml b/.woodpecker.yaml
index 063390be..9b121f2a 100644
--- a/.woodpecker.yaml
+++ b/.woodpecker.yaml
@@ -1,11 +1,14 @@
+# -*- yaml -*-
+
 steps:
   - name: codespell
     when:
-      branch:
-        - master
-        - releases/*
+      - event: [manual, pull_request]
+      - event: [push, tag]
+        branch: [master, releases/*]
     image: alpine:edge
     commands:
+      - apk add openssl
       - apk add python3
       - apk add py3-pip
       - python3 -m venv codespell-venv
@@ -16,9 +19,9 @@ steps:
 
   - name: subprojects
     when:
-      branch:
-        - master
-        - releases/*
+      - event: [manual, pull_request]
+      - event: [push, tag]
+        branch: [master, releases/*]
     image: alpine:edge
     commands:
       - apk add git
@@ -29,9 +32,9 @@ steps:
 
   - name: x64
     when:
-      branch:
-        - master
-        - releases/*
+      - event: [manual, pull_request]
+      - event: [push, tag]
+        branch: [master, releases/*]
     depends_on: [subprojects]
     image: alpine:edge
     commands:
@@ -86,9 +89,9 @@ steps:
 
   - name: x86
     when:
-      branch:
-        - master
-        - releases/*
+      - event: [manual, pull_request]
+      - event: [push, tag]
+        branch: [master, releases/*]
     depends_on: [subprojects]
     image: i386/alpine:edge
     commands:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e85730a7..b4384f0c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 # Changelog
 
+* [Unreleased](#unreleased)
 * [1.17.1](#1-17-1)
 * [1.17.0](#1-17-0)
 * [1.16.2](#1-16-2)
@@ -50,6 +51,32 @@
 * [1.2.0](#1-2-0)
 
 
+## Unreleased
+### Added
+### Changed
+
+* Notifications with invalid UTF-8 strings are now ignored.
+
+
+### Deprecated
+### Removed
+### Fixed
+
+* Crash when changing aspect ratio of a sixel, in the middle of the
+  sixel data (this is unsupported in foot, but should of course not
+  result in a crash).
+* Crash when printing double-width (or longer) characters to, or near,
+  the last column, when auto-wrap (private mode 7) has been disabled.
+* Dynamically sized sixel being trimmed to nothing.
+* Flickering with `dpi-aware=yes` and window is unmapped/remapped
+  (some compositors do this when window is minimized), in a
+  multi-monitor setup with different monitor DPIs.
+
+
+### Security
+### Contributors
+
+
 ## 1.17.1
 
 ### Added
diff --git a/osc.c b/osc.c
index 06cc7db6..446461a2 100644
--- a/osc.c
+++ b/osc.c
@@ -524,6 +524,19 @@ osc_notify(struct terminal *term, char *string)
     const char *title = strtok_r(string, ";", &ctx);
     const char *msg = strtok_r(NULL, "\x00", &ctx);
 
+    if (title == NULL)
+        return;
+
+    if (mbsntoc32(NULL, title, strlen(title), 0) == (char32_t)-1) {
+        LOG_WARN("%s: notification title is not valid UTF-8, ignoring", title);
+        return;
+    }
+
+    if (msg != NULL && mbsntoc32(NULL, msg, strlen(msg), 0) == (char32_t)-1) {
+        LOG_WARN("%s: notification message is not valid UTF-8, ignoring", msg);
+        return;
+    }
+
     notify_notify(term, title, msg != NULL ? msg : "");
 }
 
diff --git a/sixel.c b/sixel.c
index a7cbbe18..d6bfa3a4 100644
--- a/sixel.c
+++ b/sixel.c
@@ -1400,7 +1400,7 @@ resize_horizontally(struct terminal *term, int new_width_mutable)
         new_width_mutable = term->sixel.max_width;
     }
 
-    if (unlikely(term->sixel.image.width == new_width_mutable))
+    if (unlikely(term->sixel.image.width >= new_width_mutable))
         return;
 
     const int sixel_row_height = 6 * term->sixel.pan;
@@ -1414,6 +1414,7 @@ resize_horizontally(struct terminal *term, int new_width_mutable)
         /* Lazy initialize height on first printed sixel */
         xassert(old_width == 0);
         term->sixel.image.height = height = sixel_row_height;
+        term->sixel.image.alloc_height = sixel_row_height;
     } else
         height = term->sixel.image.height;
 
@@ -1423,6 +1424,7 @@ resize_horizontally(struct terminal *term, int new_width_mutable)
 
     int alloc_height = (height + sixel_row_height - 1) / sixel_row_height * sixel_row_height;
 
+    xassert(new_width >= old_width);
     xassert(new_width > 0);
     xassert(alloc_height > 0);
 
@@ -1474,6 +1476,7 @@ resize_vertically(struct terminal *term, const int new_height)
     if (unlikely(width == 0)) {
         xassert(term->sixel.image.data == NULL);
         term->sixel.image.height = new_height;
+        term->sixel.image.alloc_height = alloc_height;
         return true;
     }
 
@@ -1508,7 +1511,7 @@ resize(struct terminal *term, int new_width_mutable, int new_height_mutable)
 {
     LOG_DBG("resizing image: %dx%d -> %dx%d",
             term->sixel.image.width, term->sixel.image.height,
-            new_width, new_height);
+            new_width_mutable, new_height_mutable);
 
     if (unlikely(new_width_mutable > term->sixel.max_width)) {
         LOG_WARN("maximum image width exceeded, truncating");
@@ -1849,12 +1852,32 @@ decgra(struct terminal *term, uint8_t c)
         pan = pan > 0 ? pan : 1;
         pad = pad > 0 ? pad : 1;
 
+        if (likely(term->sixel.image.width == 0 &&
+                   term->sixel.image.height == 0))
+        {
+            term->sixel.pan = pan;
+            term->sixel.pad = pad;
+        } else {
+            /*
+             * Unsure what the VT340 does...
+             *
+             * We currently do *not* handle changing pan/pad in the
+             * middle of a sixel, since that means resizing/stretching
+             * the existing image.
+             *
+             * I'm *guessing* the VT340 simply changes the aspect
+             * ratio of all subsequent sixels. But, given the design
+             * of our implementation (the entire sixel is written to a
+             * single pixman image), we can't easily do that.
+             */
+            LOG_WARN("sixel: unsupported: pan/pad changed after printing sixels");
+            pan = term->sixel.pan;
+            pad = term->sixel.pad;
+        }
+
         pv *= pan;
         ph *= pad;
 
-        term->sixel.pan = pan;
-        term->sixel.pad = pad;
-
         LOG_DBG("pan=%u, pad=%u (aspect ratio = %d:%d), size=%ux%u",
                 pan, pad, pan, pad, ph, pv);
 
diff --git a/terminal.c b/terminal.c
index 3fb918a4..c027cfac 100644
--- a/terminal.c
+++ b/terminal.c
@@ -858,9 +858,25 @@ get_font_dpi(const struct terminal *term)
     xassert(tll_length(term->wl->monitors) > 0);
 
     const struct wl_window *win = term->window;
-    const struct monitor *mon = tll_length(win->on_outputs) > 0
-        ? tll_back(win->on_outputs)
-        : &tll_front(term->wl->monitors);
+    const struct monitor *mon = NULL;
+
+    if (tll_length(win->on_outputs) > 0)
+        mon = tll_back(win->on_outputs);
+    else {
+        if (term->font_dpi_before_unmap > 0.) {
+            /*
+             * Use last known "good" DPI
+             *
+             * This avoids flickering when window is unmapped/mapped
+             * (some compositors do this when a window is minimized),
+             * on a multi-monitor setup with different monitor DPIs.
+             */
+            return term->font_dpi_before_unmap;
+        }
+
+        if (tll_length(term->wl->monitors) > 0)
+            mon = &tll_front(term->wl->monitors);
+    }
 
     if (term_fractional_scaling(term))
         return mon != NULL ? mon->dpi.physical : 96.;
@@ -1182,6 +1198,7 @@ term_init(const struct config *conf, struct fdm *fdm, struct reaper *reaper,
             xmalloc(sizeof(term->font_sizes[3][0]) * conf->fonts[3].count),
         },
         .font_dpi = 0.,
+        .font_dpi_before_unmap = -1.,
         .font_subpixel = (conf->colors.alpha == 0xffff  /* Can't do subpixel rendering on transparent background */
                           ? FCFT_SUBPIXEL_DEFAULT
                           : FCFT_SUBPIXEL_NONE),
@@ -2181,7 +2198,7 @@ term_fractional_scaling(const struct terminal *term)
 bool
 term_preferred_buffer_scale(const struct terminal *term)
 {
-    return term->wl->has_wl_compositor_v6 && term->window->preferred_buffer_scale > 0;
+    return term->window->preferred_buffer_scale > 0;
 }
 
 bool
@@ -2250,6 +2267,7 @@ term_font_dpi_changed(struct terminal *term, float old_scale)
     }
 
     term->font_dpi = dpi;
+    term->font_dpi_before_unmap = dpi;
     term->font_is_sized_by_dpi = will_scale_using_dpi;
 
     if (!need_font_reload)
@@ -3680,11 +3698,13 @@ term_print(struct terminal *term, char32_t wc, int width)
         grid_row_uri_range_erase(row, col, col + width - 1);
 
     /* Advance cursor the 'additional' columns while dirty:ing the cells */
-    for (int i = 1; i < width && col < term->cols; i++) {
+    for (int i = 1; i < width && (col + 1) < term->cols; i++) {
         col++;
         print_spacer(term, col, width - i);
     }
 
+    xassert(col < term->cols);
+
     /* Advance cursor */
     if (unlikely(++col >= term->cols)) {
         grid->cursor.lcf = true;
@@ -3726,6 +3746,7 @@ ascii_printer_fast(struct terminal *term, char32_t wc)
 
     /* Advance cursor */
     if (unlikely(++col >= term->cols)) {
+        xassert(col == term->cols);
         grid->cursor.lcf = true;
         col--;
     } else
diff --git a/terminal.h b/terminal.h
index fa80e693..2a0845ef 100644
--- a/terminal.h
+++ b/terminal.h
@@ -406,6 +406,7 @@ struct terminal {
     struct config_font *font_sizes[4];
     struct pt_or_px font_line_height;
     float font_dpi;
+    float font_dpi_before_unmap;
     bool font_is_sized_by_dpi;
     int16_t font_x_ofs;
     int16_t font_y_ofs;
diff --git a/wayland.c b/wayland.c
index 1d9d3cdf..4add34e3 100644
--- a/wayland.c
+++ b/wayland.c
@@ -1096,7 +1096,6 @@ handle_global(void *data, struct wl_registry *registry,
 
 #if defined (WL_SURFACE_PREFERRED_BUFFER_SCALE_SINCE_VERSION)
         const uint32_t preferred = WL_SURFACE_PREFERRED_BUFFER_SCALE_SINCE_VERSION;
-        wayl->has_wl_compositor_v6 = version >= WL_SURFACE_PREFERRED_BUFFER_SCALE_SINCE_VERSION;
 #else
         const uint32_t preferred = required;
 #endif
diff --git a/wayland.h b/wayland.h
index 84fcbe48..575af1bb 100644
--- a/wayland.h
+++ b/wayland.h
@@ -430,8 +430,6 @@ struct wayland {
     struct wl_subcompositor *sub_compositor;
     struct wl_shm *shm;
 
-    bool has_wl_compositor_v6;
-
     struct zxdg_output_manager_v1 *xdg_output_manager;
 
     struct xdg_wm_base *shell;