3 files changed, 27 insertions, 13 deletions
diff --git a/src/nvim/drawscreen.c b/src/nvim/drawscreen.c
index 835fdcf7d0..e03cffd1ca 100644
--- a/src/nvim/drawscreen.c
+++ b/src/nvim/drawscreen.c
@@ -290,9 +290,23 @@ void screen_resize(int width, int height)
   Rows = height;
   Columns = width;
   check_screensize();
-  int max_p_ch = Rows - min_rows() + 1;
-  if (!ui_has(kUIMessages) && p_ch > 0 && p_ch > max_p_ch) {
-    p_ch = max_p_ch ? max_p_ch : 1;
+  if (!ui_has(kUIMessages)) {
+    // clamp 'cmdheight'
+    int max_p_ch = Rows - min_rows(curtab) + 1;
+    if (p_ch > 0 && p_ch > max_p_ch) {
+      p_ch = MAX(max_p_ch, 1);
+      curtab->tp_ch_used = p_ch;
+    }
+    // clamp 'cmdheight' for other tab pages
+    FOR_ALL_TABS(tp) {
+      if (tp == curtab) {
+        continue;  // already set above
+      }
+      int max_tp_ch = Rows - min_rows(tp) + 1;
+      if (tp->tp_ch_used > 0 && tp->tp_ch_used > max_tp_ch) {
+        tp->tp_ch_used = MAX(max_tp_ch, 1);
+      }
+    }
   }
   height = Rows;
   width = Columns;
diff --git a/src/nvim/option.c b/src/nvim/option.c
index 6da9635479..fd0ac375a6 100644
--- a/src/nvim/option.c
+++ b/src/nvim/option.c
@@ -1977,8 +1977,8 @@ static const char *did_set_cmdheight(optset_T *args)
 {
   OptInt old_value = args->os_oldval.number;
 
-  if (p_ch > Rows - min_rows() + 1) {
-    p_ch = Rows - min_rows() + 1;
+  if (p_ch > Rows - min_rows(curtab) + 1) {
+    p_ch = Rows - min_rows(curtab) + 1;
   }
 
   // if p_ch changed value, change the command line height
diff --git a/src/nvim/window.c b/src/nvim/window.c
index d92b2ab601..79c3ce9304 100644
--- a/src/nvim/window.c
+++ b/src/nvim/window.c
@@ -7065,17 +7065,17 @@ int last_stl_height(bool morewin)
 }
 
 /// Return the minimal number of rows that is needed on the screen to display
-/// the current number of windows.
-int min_rows(void)
+/// the current number of windows for the given tab page.
+int min_rows(tabpage_T *tp) FUNC_ATTR_NONNULL_ALL
 {
   if (firstwin == NULL) {       // not initialized yet
     return MIN_LINES;
   }
 
-  int total = frame_minheight(curtab->tp_topframe, NULL);
+  int total = frame_minheight(tp->tp_topframe, NULL);
   total += tabline_height() + global_stl_height();
-  if (p_ch > 0) {
-    total += 1;           // count the room for the command line
+  if ((tp == curtab ? p_ch : tp->tp_ch_used) > 0) {
+    total++;  // count the room for the command line
   }
   return total;
 }
@@ -7091,12 +7091,12 @@ int min_rows_for_all_tabpages(void)
   int total = 0;
   FOR_ALL_TABS(tp) {
     int n = frame_minheight(tp->tp_topframe, NULL);
+    if ((tp == curtab ? p_ch : tp->tp_ch_used) > 0) {
+      n++;  // count the room for the command line
+    }
     total = MAX(total, n);
   }
   total += tabline_height() + global_stl_height();
-  if (p_ch > 0) {
-    total += 1;           // count the room for the command line
-  }
   return total;
 }