fix(statusline): also allow right click when 'mousemodel' is "popup*" (#23258)

Problem:    The 'statusline'-format ui elements do not receive right
            click events when "mousemodel" is "popup*"
Solution:   Do not draw popupmenu and handle click event instead.

4 files changed, 248 insertions, 238 deletions

diff --git a/src/nvim/mouse.c b/src/nvim/mouse.c
index 28b40994a1..c00ccdd51a 100644
--- a/src/nvim/mouse.c
+++ b/src/nvim/mouse.c
@@ -212,22 +212,31 @@ static int get_fpos_of_mouse(pos_T *mpos)
   if (wp == NULL) {
     return IN_UNKNOWN;
   }
+  int winrow = row;
+  int wincol = col;
+
+  // compute the position in the buffer line from the posn on the screen
+  bool below_buffer = mouse_comp_pos(wp, &row, &col, &mpos->lnum);
+
+  if (!below_buffer && *wp->w_p_stc != NUL && mouse_col < win_col_off(wp)) {
+    return MOUSE_STATUSCOL;
+  }
 
   // winpos and height may change in win_enter()!
-  if (row + wp->w_winbar_height >= wp->w_height) {  // In (or below) status line
+  if (winrow + wp->w_winbar_height >= wp->w_height) {  // In (or below) status line
     return IN_STATUS_LINE;
   }
-  if (col >= wp->w_width) {  // In vertical separator line
-    return IN_SEP_LINE;
+
+  if (winrow == -1 && wp->w_winbar_height != 0) {
+    return MOUSE_WINBAR;
   }
 
-  if (wp != curwin) {
-    return IN_UNKNOWN;
+  if (wincol >= wp->w_width) {  // In vertical separator line
+    return IN_SEP_LINE;
   }
 
-  // compute the position in the buffer line from the posn on the screen
-  if (mouse_comp_pos(curwin, &row, &col, &mpos->lnum)) {
-    return IN_STATUS_LINE;  // past bottom
+  if (wp != curwin || below_buffer) {
+    return IN_UNKNOWN;
   }
 
   mpos->col = vcol2col(wp, mpos->lnum, col);
@@ -530,6 +539,11 @@ bool do_mouse(oparg_T *oap, int c, int dir, long count, bool fixindent)
   // shift-left button -> right button
   // alt-left button   -> alt-right button
   if (mouse_model_popup()) {
+    pos_T m_pos;
+    int m_pos_flag = get_fpos_of_mouse(&m_pos);
+    if (m_pos_flag & (IN_STATUS_LINE|MOUSE_WINBAR|MOUSE_STATUSCOL)) {
+      goto popupexit;
+    }
     if (which_button == MOUSE_RIGHT
         && !(mod_mask & (MOD_MASK_SHIFT | MOD_MASK_CTRL))) {
       if (!is_click) {
@@ -539,17 +553,14 @@ bool do_mouse(oparg_T *oap, int c, int dir, long count, bool fixindent)
       }
       jump_flags = 0;
       if (strcmp(p_mousem, "popup_setpos") == 0) {
-        // First set the cursor position before showing the popup
-        // menu.
+        // First set the cursor position before showing the popup menu.
         if (VIsual_active) {
-          pos_T m_pos;
-          // set MOUSE_MAY_STOP_VIS if we are outside the
-          // selection or the current window (might have false
-          // negative here)
+          // set MOUSE_MAY_STOP_VIS if we are outside the selection
+          // or the current window (might have false negative here)
           if (mouse_row < curwin->w_winrow
               || mouse_row > (curwin->w_winrow + curwin->w_height)) {
             jump_flags = MOUSE_MAY_STOP_VIS;
-          } else if (get_fpos_of_mouse(&m_pos) != IN_BUFFER) {
+          } else if (m_pos_flag != IN_BUFFER) {
             jump_flags = MOUSE_MAY_STOP_VIS;
           } else {
             if (VIsual_mode == 'V') {
@@ -593,6 +604,7 @@ bool do_mouse(oparg_T *oap, int c, int dir, long count, bool fixindent)
       mod_mask &= ~MOD_MASK_SHIFT;
     }
   }
+popupexit:
 
   if ((State & (MODE_NORMAL | MODE_INSERT))
       && !(mod_mask & (MOD_MASK_SHIFT | MOD_MASK_CTRL))) {
@@ -644,7 +656,7 @@ bool do_mouse(oparg_T *oap, int c, int dir, long count, bool fixindent)
   in_sep_line = (jump_flags & IN_SEP_LINE);
 
   if ((in_winbar || in_status_line || in_statuscol) && is_click) {
-    // Handle click event on window bar or status lin
+    // Handle click event on window bar, status line or status column
     int click_grid = mouse_grid;
     int click_row = mouse_row;
     int click_col = mouse_col;
@@ -672,7 +684,7 @@ bool do_mouse(oparg_T *oap, int c, int dir, long count, bool fixindent)
         call_click_def_func(click_defs, click_col, which_button);
         break;
       default:
-        assert(false && "winbar and statusline only support %@ for clicks");
+        assert(false && "winbar, statusline and statuscolumn only support %@ for clicks");
         break;
       }
     }
diff --git a/test/functional/ui/mouse_spec.lua b/test/functional/ui/mouse_spec.lua
index f705678bd5..c7f6861c12 100644
--- a/test/functional/ui/mouse_spec.lua
+++ b/test/functional/ui/mouse_spec.lua
@@ -1840,16 +1840,6 @@ describe('ui/mouse/input', function()
     eq({2, 9}, meths.win_get_cursor(0))
     eq('', funcs.getreg('"'))
 
-    -- Try clicking on the status line
-    funcs.setreg('"', '')
-    meths.win_set_cursor(0, {1, 9})
-    feed('vee')
-    meths.input_mouse('right', 'press', '', 0, 5, 1)
-    meths.input_mouse('right', 'release', '', 0, 5, 1)
-    feed('<Down><CR>')
-    eq({1, 9}, meths.win_get_cursor(0))
-    eq('ran away', funcs.getreg('"'))
-
     -- Try clicking outside the window
     funcs.setreg('"', '')
     meths.win_set_cursor(0, {2, 1})
diff --git a/test/functional/ui/statuscolumn_spec.lua b/test/functional/ui/statuscolumn_spec.lua
index c4b055d289..3b41d3684a 100644
--- a/test/functional/ui/statuscolumn_spec.lua
+++ b/test/functional/ui/statuscolumn_spec.lua
@@ -9,6 +9,8 @@ local feed = helpers.feed
 local meths = helpers.meths
 local pcall_err = helpers.pcall_err
 
+local mousemodels = { "extend", "popup", "popup_setpos" }
+
 describe('statuscolumn', function()
   local screen
   before_each(function()
@@ -420,45 +422,47 @@ describe('statuscolumn', function()
     ]])
   end)
 
-  it("works with 'statuscolumn' clicks", function()
-    command('set mousemodel=extend')
-    command([[
-      function! MyClickFunc(minwid, clicks, button, mods)
-        let g:testvar = printf("%d %d %s %d", a:minwid, a:clicks, a:button, getmousepos().line)
-        if a:mods !=# '    '
-          let g:testvar ..= '(' .. a:mods .. ')'
-        endif
-      endfunction
-      set stc=%0@MyClickFunc@%=%l%T
-    ]])
-    meths.input_mouse('left', 'press', '', 0, 0, 0)
-    eq('0 1 l 4', eval("g:testvar"))
-    meths.input_mouse('left', 'press', '', 0, 0, 0)
-    eq('0 2 l 4', eval("g:testvar"))
-    meths.input_mouse('left', 'press', '', 0, 0, 0)
-    eq('0 3 l 4', eval("g:testvar"))
-    meths.input_mouse('left', 'press', '', 0, 0, 0)
-    eq('0 4 l 4', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 3, 0)
-    eq('0 1 r 7', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 3, 0)
-    eq('0 2 r 7', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 3, 0)
-    eq('0 3 r 7', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 3, 0)
-    eq('0 4 r 7', eval("g:testvar"))
-    command('set laststatus=2 winbar=%f')
-    command('let g:testvar=""')
-    -- Check that winbar click doesn't register as statuscolumn click
-    meths.input_mouse('right', 'press', '', 0, 0, 0)
-    eq('', eval("g:testvar"))
-    -- Check that statusline click doesn't register as statuscolumn click
-    meths.input_mouse('right', 'press', '', 0, 12, 0)
-    eq('', eval("g:testvar"))
-    -- Check that cmdline click doesn't register as statuscolumn click
-    meths.input_mouse('right', 'press', '', 0, 13, 0)
-    eq('', eval("g:testvar"))
-  end)
+  for _, model in ipairs(mousemodels) do
+    it("works with 'statuscolumn' clicks with mousemodel=" .. model, function()
+      command('set mousemodel=' .. model)
+      command([[
+        function! MyClickFunc(minwid, clicks, button, mods)
+          let g:testvar = printf("%d %d %s %d", a:minwid, a:clicks, a:button, getmousepos().line)
+          if a:mods !=# '    '
+            let g:testvar ..= '(' .. a:mods .. ')'
+          endif
+        endfunction
+        set stc=%0@MyClickFunc@%=%l%T
+      ]])
+      meths.input_mouse('left', 'press', '', 0, 0, 0)
+      eq('0 1 l 4', eval("g:testvar"))
+      meths.input_mouse('left', 'press', '', 0, 0, 0)
+      eq('0 2 l 4', eval("g:testvar"))
+      meths.input_mouse('left', 'press', '', 0, 0, 0)
+      eq('0 3 l 4', eval("g:testvar"))
+      meths.input_mouse('left', 'press', '', 0, 0, 0)
+      eq('0 4 l 4', eval("g:testvar"))
+      meths.input_mouse('right', 'press', '', 0, 3, 0)
+      eq('0 1 r 7', eval("g:testvar"))
+      meths.input_mouse('right', 'press', '', 0, 3, 0)
+      eq('0 2 r 7', eval("g:testvar"))
+      meths.input_mouse('right', 'press', '', 0, 3, 0)
+      eq('0 3 r 7', eval("g:testvar"))
+      meths.input_mouse('right', 'press', '', 0, 3, 0)
+      eq('0 4 r 7', eval("g:testvar"))
+      command('set laststatus=2 winbar=%f')
+      command('let g:testvar=""')
+      -- Check that winbar click doesn't register as statuscolumn click
+      meths.input_mouse('right', 'press', '', 0, 0, 0)
+      eq('', eval("g:testvar"))
+      -- Check that statusline click doesn't register as statuscolumn click
+      meths.input_mouse('right', 'press', '', 0, 12, 0)
+      eq('', eval("g:testvar"))
+      -- Check that cmdline click doesn't register as statuscolumn click
+      meths.input_mouse('right', 'press', '', 0, 13, 0)
+      eq('', eval("g:testvar"))
+    end)
+  end
 
   it('click labels do not leak memory', function()
     command([[
diff --git a/test/functional/ui/statusline_spec.lua b/test/functional/ui/statusline_spec.lua
index c41d4983a7..5ea4eade4e 100644
--- a/test/functional/ui/statusline_spec.lua
+++ b/test/functional/ui/statusline_spec.lua
@@ -12,178 +12,182 @@ local exec_lua = helpers.exec_lua
 local eval = helpers.eval
 local sleep = helpers.sleep
 
-describe('statusline clicks', function()
-  local screen
-
-  before_each(function()
-    clear()
-    screen = Screen.new(40, 8)
-    screen:attach()
-    command('set laststatus=2 mousemodel=extend')
-    exec([=[
-      function! MyClickFunc(minwid, clicks, button, mods)
-        let g:testvar = printf("%d %d %s", a:minwid, a:clicks, a:button)
-        if a:mods !=# '    '
-          let g:testvar ..= '(' .. a:mods .. ')'
-        endif
-      endfunction
-    ]=])
-  end)
-
-  it('works', function()
-    meths.set_option('statusline', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T')
-    meths.input_mouse('left', 'press', '', 0, 6, 17)
-    eq('0 1 l', eval("g:testvar"))
-    meths.input_mouse('left', 'press', '', 0, 6, 17)
-    eq('0 2 l', eval("g:testvar"))
-    meths.input_mouse('left', 'press', '', 0, 6, 17)
-    eq('0 3 l', eval("g:testvar"))
-    meths.input_mouse('left', 'press', '', 0, 6, 17)
-    eq('0 4 l', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 6, 17)
-    eq('0 1 r', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 6, 17)
-    eq('0 2 r', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 6, 17)
-    eq('0 3 r', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 6, 17)
-    eq('0 4 r', eval("g:testvar"))
-  end)
-
-  it('works for winbar', function()
-    meths.set_option('winbar', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T')
-    meths.input_mouse('left', 'press', '', 0, 0, 17)
-    eq('0 1 l', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 0, 17)
-    eq('0 1 r', eval("g:testvar"))
-  end)
-
-  it('works for winbar in floating window', function()
-    meths.open_win(0, true, { width=30, height=4, relative='editor', row=1, col=5,
-                              border = "single" })
-    meths.set_option_value('winbar', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T',
-                           { scope = 'local' })
-    meths.input_mouse('left', 'press', '', 0, 2, 23)
-    eq('0 1 l', eval("g:testvar"))
-  end)
-
-  it('works when there are multiple windows', function()
-    command('split')
-    meths.set_option('statusline', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T')
-    meths.set_option('winbar', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T')
-    meths.input_mouse('left', 'press', '', 0, 0, 17)
-    eq('0 1 l', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 4, 17)
-    eq('0 1 r', eval("g:testvar"))
-    meths.input_mouse('middle', 'press', '', 0, 3, 17)
-    eq('0 1 m', eval("g:testvar"))
-    meths.input_mouse('left', 'press', '', 0, 6, 17)
-    eq('0 1 l', eval("g:testvar"))
-  end)
-
-  it('works with Lua function', function()
-    exec_lua([[
-      function clicky_func(minwid, clicks, button, mods)
-        vim.g.testvar = string.format("%d %d %s", minwid, clicks, button)
-      end
-    ]])
-    meths.set_option('statusline', 'Not clicky stuff %0@v:lua.clicky_func@Clicky stuff%T')
-    meths.input_mouse('left', 'press', '', 0, 6, 17)
-    eq('0 1 l', eval("g:testvar"))
-  end)
-
-  it('ignores unsupported click items', function()
-    command('tabnew | tabprevious')
-    meths.set_option('statusline', '%2TNot clicky stuff%T')
-    meths.input_mouse('left', 'press', '', 0, 6, 0)
-    eq(1, meths.get_current_tabpage().id)
-    meths.set_option('statusline', '%2XNot clicky stuff%X')
-    meths.input_mouse('left', 'press', '', 0, 6, 0)
-    eq(2, #meths.list_tabpages())
-  end)
-
-  it("right click works when statusline isn't focused #18994", function()
-    meths.set_option('statusline', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T')
-    meths.input_mouse('right', 'press', '', 0, 6, 17)
-    eq('0 1 r', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 6, 17)
-    eq('0 2 r', eval("g:testvar"))
-  end)
-
-  it("works with modifiers #18994", function()
-    meths.set_option('statusline', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T')
-    -- Note: alternate between left and right mouse buttons to avoid triggering multiclicks
-    meths.input_mouse('left', 'press', 'S', 0, 6, 17)
-    eq('0 1 l(s   )', eval("g:testvar"))
-    meths.input_mouse('right', 'press', 'S', 0, 6, 17)
-    eq('0 1 r(s   )', eval("g:testvar"))
-    meths.input_mouse('left', 'press', 'A', 0, 6, 17)
-    eq('0 1 l(  a )', eval("g:testvar"))
-    meths.input_mouse('right', 'press', 'A', 0, 6, 17)
-    eq('0 1 r(  a )', eval("g:testvar"))
-    meths.input_mouse('left', 'press', 'AS', 0, 6, 17)
-    eq('0 1 l(s a )', eval("g:testvar"))
-    meths.input_mouse('right', 'press', 'AS', 0, 6, 17)
-    eq('0 1 r(s a )', eval("g:testvar"))
-    meths.input_mouse('left', 'press', 'T', 0, 6, 17)
-    eq('0 1 l(   m)', eval("g:testvar"))
-    meths.input_mouse('right', 'press', 'T', 0, 6, 17)
-    eq('0 1 r(   m)', eval("g:testvar"))
-    meths.input_mouse('left', 'press', 'TS', 0, 6, 17)
-    eq('0 1 l(s  m)', eval("g:testvar"))
-    meths.input_mouse('right', 'press', 'TS', 0, 6, 17)
-    eq('0 1 r(s  m)', eval("g:testvar"))
-    meths.input_mouse('left', 'press', 'C', 0, 6, 17)
-    eq('0 1 l( c  )', eval("g:testvar"))
-    -- <C-RightMouse> is for tag jump
-  end)
-
-  it("works for global statusline with vertical splits #19186", function()
-    command('set laststatus=3')
-    meths.set_option('statusline', '%0@MyClickFunc@Clicky stuff%T %= %0@MyClickFunc@Clicky stuff%T')
-    command('vsplit')
-    screen:expect([[
-      ^                    │                   |
-      ~                   │~                  |
-      ~                   │~                  |
-      ~                   │~                  |
-      ~                   │~                  |
-      ~                   │~                  |
-      Clicky stuff                Clicky stuff|
-                                              |
-    ]])
-
-    -- clickable area on the right
-    meths.input_mouse('left', 'press', '', 0, 6, 35)
-    eq('0 1 l', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 6, 35)
-    eq('0 1 r', eval("g:testvar"))
-
-    -- clickable area on the left
-    meths.input_mouse('left', 'press', '', 0, 6, 5)
-    eq('0 1 l', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 6, 5)
-    eq('0 1 r', eval("g:testvar"))
-  end)
-
-  it('no memory leak with zero-width click labels', function()
-    command([[
-      let &stl = '%@Test@%T%@MyClickFunc@%=%T%@Test@'
-    ]])
-    meths.input_mouse('left', 'press', '', 0, 6, 0)
-    eq('0 1 l', eval("g:testvar"))
-    meths.input_mouse('right', 'press', '', 0, 6, 39)
-    eq('0 1 r', eval("g:testvar"))
-  end)
-
-  it('no memory leak with truncated click labels', function()
-    command([[
-      let &stl = '%@MyClickFunc@foo%X' .. repeat('a', 40) .. '%<t%@Test@bar%X%@Test@baz'
-    ]])
-    meths.input_mouse('left', 'press', '', 0, 6, 2)
-    eq('0 1 l', eval("g:testvar"))
-  end)
-end)
+local mousemodels = { "extend", "popup", "popup_setpos" }
+
+for _, model in ipairs(mousemodels) do
+  describe('statusline clicks with mousemodel=' .. model, function()
+    local screen
+
+    before_each(function()
+      clear()
+      screen = Screen.new(40, 8)
+      screen:attach()
+      command('set laststatus=2 mousemodel=' .. model)
+      exec([=[
+        function! MyClickFunc(minwid, clicks, button, mods)
+          let g:testvar = printf("%d %d %s", a:minwid, a:clicks, a:button)
+          if a:mods !=# '    '
+            let g:testvar ..= '(' .. a:mods .. ')'
+          endif
+        endfunction
+      ]=])
+      end)
+
+      it('works', function()
+        meths.set_option('statusline', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T')
+        meths.input_mouse('left', 'press', '', 0, 6, 17)
+        eq('0 1 l', eval("g:testvar"))
+        meths.input_mouse('left', 'press', '', 0, 6, 17)
+        eq('0 2 l', eval("g:testvar"))
+        meths.input_mouse('left', 'press', '', 0, 6, 17)
+        eq('0 3 l', eval("g:testvar"))
+        meths.input_mouse('left', 'press', '', 0, 6, 17)
+        eq('0 4 l', eval("g:testvar"))
+        meths.input_mouse('right', 'press', '', 0, 6, 17)
+        eq('0 1 r', eval("g:testvar"))
+        meths.input_mouse('right', 'press', '', 0, 6, 17)
+        eq('0 2 r', eval("g:testvar"))
+        meths.input_mouse('right', 'press', '', 0, 6, 17)
+        eq('0 3 r', eval("g:testvar"))
+        meths.input_mouse('right', 'press', '', 0, 6, 17)
+        eq('0 4 r', eval("g:testvar"))
+      end)
+
+      it('works for winbar', function()
+        meths.set_option('winbar', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T')
+        meths.input_mouse('left', 'press', '', 0, 0, 17)
+        eq('0 1 l', eval("g:testvar"))
+        meths.input_mouse('right', 'press', '', 0, 0, 17)
+        eq('0 1 r', eval("g:testvar"))
+      end)
+
+      it('works for winbar in floating window', function()
+        meths.open_win(0, true, { width=30, height=4, relative='editor', row=1, col=5,
+        border = "single" })
+        meths.set_option_value('winbar', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T',
+        { scope = 'local' })
+        meths.input_mouse('left', 'press', '', 0, 2, 23)
+        eq('0 1 l', eval("g:testvar"))
+      end)
+
+      it('works when there are multiple windows', function()
+        command('split')
+        meths.set_option('statusline', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T')
+        meths.set_option('winbar', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T')
+        meths.input_mouse('left', 'press', '', 0, 0, 17)
+        eq('0 1 l', eval("g:testvar"))
+        meths.input_mouse('right', 'press', '', 0, 4, 17)
+        eq('0 1 r', eval("g:testvar"))
+        meths.input_mouse('middle', 'press', '', 0, 3, 17)
+        eq('0 1 m', eval("g:testvar"))
+        meths.input_mouse('left', 'press', '', 0, 6, 17)
+        eq('0 1 l', eval("g:testvar"))
+      end)
+
+      it('works with Lua function', function()
+        exec_lua([[
+        function clicky_func(minwid, clicks, button, mods)
+          vim.g.testvar = string.format("%d %d %s", minwid, clicks, button)
+        end
+        ]])
+        meths.set_option('statusline', 'Not clicky stuff %0@v:lua.clicky_func@Clicky stuff%T')
+        meths.input_mouse('left', 'press', '', 0, 6, 17)
+        eq('0 1 l', eval("g:testvar"))
+      end)
+
+      it('ignores unsupported click items', function()
+        command('tabnew | tabprevious')
+        meths.set_option('statusline', '%2TNot clicky stuff%T')
+        meths.input_mouse('left', 'press', '', 0, 6, 0)
+        eq(1, meths.get_current_tabpage().id)
+        meths.set_option('statusline', '%2XNot clicky stuff%X')
+        meths.input_mouse('left', 'press', '', 0, 6, 0)
+        eq(2, #meths.list_tabpages())
+      end)
+
+      it("right click works when statusline isn't focused #18994", function()
+        meths.set_option('statusline', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T')
+        meths.input_mouse('right', 'press', '', 0, 6, 17)
+        eq('0 1 r', eval("g:testvar"))
+        meths.input_mouse('right', 'press', '', 0, 6, 17)
+        eq('0 2 r', eval("g:testvar"))
+      end)
+
+      it("works with modifiers #18994", function()
+        meths.set_option('statusline', 'Not clicky stuff %0@MyClickFunc@Clicky stuff%T')
+        -- Note: alternate between left and right mouse buttons to avoid triggering multiclicks
+        meths.input_mouse('left', 'press', 'S', 0, 6, 17)
+        eq('0 1 l(s   )', eval("g:testvar"))
+        meths.input_mouse('right', 'press', 'S', 0, 6, 17)
+        eq('0 1 r(s   )', eval("g:testvar"))
+        meths.input_mouse('left', 'press', 'A', 0, 6, 17)
+        eq('0 1 l(  a )', eval("g:testvar"))
+        meths.input_mouse('right', 'press', 'A', 0, 6, 17)
+        eq('0 1 r(  a )', eval("g:testvar"))
+        meths.input_mouse('left', 'press', 'AS', 0, 6, 17)
+        eq('0 1 l(s a )', eval("g:testvar"))
+        meths.input_mouse('right', 'press', 'AS', 0, 6, 17)
+        eq('0 1 r(s a )', eval("g:testvar"))
+        meths.input_mouse('left', 'press', 'T', 0, 6, 17)
+        eq('0 1 l(   m)', eval("g:testvar"))
+        meths.input_mouse('right', 'press', 'T', 0, 6, 17)
+        eq('0 1 r(   m)', eval("g:testvar"))
+        meths.input_mouse('left', 'press', 'TS', 0, 6, 17)
+        eq('0 1 l(s  m)', eval("g:testvar"))
+        meths.input_mouse('right', 'press', 'TS', 0, 6, 17)
+        eq('0 1 r(s  m)', eval("g:testvar"))
+        meths.input_mouse('left', 'press', 'C', 0, 6, 17)
+        eq('0 1 l( c  )', eval("g:testvar"))
+        -- <C-RightMouse> is for tag jump
+      end)
+
+      it("works for global statusline with vertical splits #19186", function()
+        command('set laststatus=3')
+        meths.set_option('statusline', '%0@MyClickFunc@Clicky stuff%T %= %0@MyClickFunc@Clicky stuff%T')
+        command('vsplit')
+        screen:expect([[
+        ^                    │                   |
+        ~                   │~                  |
+        ~                   │~                  |
+        ~                   │~                  |
+        ~                   │~                  |
+        ~                   │~                  |
+        Clicky stuff                Clicky stuff|
+                                                |
+        ]])
+
+        -- clickable area on the right
+        meths.input_mouse('left', 'press', '', 0, 6, 35)
+        eq('0 1 l', eval("g:testvar"))
+        meths.input_mouse('right', 'press', '', 0, 6, 35)
+        eq('0 1 r', eval("g:testvar"))
+
+        -- clickable area on the left
+        meths.input_mouse('left', 'press', '', 0, 6, 5)
+        eq('0 1 l', eval("g:testvar"))
+        meths.input_mouse('right', 'press', '', 0, 6, 5)
+        eq('0 1 r', eval("g:testvar"))
+      end)
+
+      it('no memory leak with zero-width click labels', function()
+        command([[
+        let &stl = '%@Test@%T%@MyClickFunc@%=%T%@Test@'
+        ]])
+        meths.input_mouse('left', 'press', '', 0, 6, 0)
+        eq('0 1 l', eval("g:testvar"))
+        meths.input_mouse('right', 'press', '', 0, 6, 39)
+        eq('0 1 r', eval("g:testvar"))
+      end)
+
+      it('no memory leak with truncated click labels', function()
+        command([[
+        let &stl = '%@MyClickFunc@foo%X' .. repeat('a', 40) .. '%<t%@Test@bar%X%@Test@baz'
+        ]])
+        meths.input_mouse('left', 'press', '', 0, 6, 2)
+        eq('0 1 l', eval("g:testvar"))
+      end)
+    end)
+end
 
 describe('global statusline', function()
   local screen