(mini.hipatterns) Fix error after deleting first line in a buffer.

Details:
- Resolves #536.

lua/mini/hipatterns.lua

@@ -421,7 +421,7 @@ MiniHipatterns.disable = function(buf_id)
   H.cache[buf_id] = nil
 
   vim.api.nvim_del_augroup_by_id(buf_cache.augroup)
-  vim.api.nvim_buf_clear_namespace(buf_id, H.ns_id.highlight, 0, -1)
+  H.clear_namespace(buf_id, H.ns_id.highlight, 0, -1)
 end
 
 --- Toggle highlighting in buffer
@@ -825,7 +825,7 @@ H.process_buffer_changes = vim.schedule_wrap(function(buf_id, lines_to_process)
   -- Remove current highlights
   local ns = H.ns_id.highlight
   for l_num, _ in pairs(lines_to_process) do
-    vim.api.nvim_buf_clear_namespace(buf_id, ns, l_num - 1, l_num)
+    H.clear_namespace(buf_id, ns, l_num - 1, l_num)
   end
 
   -- Add new highlights
@@ -919,6 +919,8 @@ H.get_line =
 
 H.set_extmark = function(...) pcall(vim.api.nvim_buf_set_extmark, ...) end
 
+H.clear_namespace = function(...) pcall(vim.api.nvim_buf_clear_namespace, ...) end
+
 H.always_true = function() return true end
 
 H.cuberoot = function(x) return math.pow(x, 0.333333) end

tests/screenshots/tests-test_hipatterns.lua---enable()---reacts-to-delete-of-line-with-match

@@ -1,23 +1,23 @@
 --|---------|-----
-01|xxx            
+01|abcd      Hello
 02|xxx            
-03|abcd      Hello
-04|xxx            
+03|xxx            
+04|abcd      Hello
 05|xxx            
-06|~              
-07|~              
+06|xxx            
+07|abcd      Hello
 08|~              
 09|<e] [+] 1,1 All
 10|               
 
 --|---------|-----
-01|000000000000000
+01|000000000011111
 02|000000000000000
-03|000000000011111
-04|000000000000000
+03|000000000000000
+04|000000000011111
 05|000000000000000
-06|222222222222222
-07|222222222222222
+06|000000000000000
+07|000000000011111
 08|222222222222222
 09|333333333333333
 10|444444444444444

tests/screenshots/tests-test_hipatterns.lua---enable()---reacts-to-delete-of-line-with-match-002

@@ -1,23 +1,23 @@
 --|---------|-----
 01|xxx            
 02|xxx            
-03|xxx            
+03|abcd      Hello
 04|xxx            
-05|~              
-06|~              
+05|xxx            
+06|abcd      Hello
 07|~              
 08|~              
-09|<e] [+] 3,1 All
+09|<e] [+] 1,1 All
 10|               
 
 --|---------|-----
 01|000000000000000
 02|000000000000000
-03|000000000000000
+03|000000000011111
 04|000000000000000
-05|111111111111111
-06|111111111111111
-07|111111111111111
-08|111111111111111
-09|222222222222222
-10|333333333333333
+05|000000000000000
+06|000000000011111
+07|222222222222222
+08|222222222222222
+09|333333333333333
+10|444444444444444

tests/screenshots/tests-test_hipatterns.lua---enable()---reacts-to-delete-of-line-with-match-003

@@ -0,0 +1,23 @@
+--|---------|-----
+01|xxx            
+02|xxx            
+03|xxx            
+04|xxx            
+05|abcd      Hello
+06|~              
+07|~              
+08|~              
+09|<e] [+] 3,1 All
+10|               
+
+--|---------|-----
+01|000000000000000
+02|000000000000000
+03|000000000000000
+04|000000000000000
+05|000000000011111
+06|222222222222222
+07|222222222222222
+08|222222222222222
+09|333333333333333
+10|444444444444444

tests/screenshots/tests-test_hipatterns.lua---enable()---reacts-to-delete-of-line-with-match-004

@@ -0,0 +1,23 @@
+--|---------|-----
+01|xxx            
+02|xxx            
+03|xxx            
+04|xxx            
+05|~              
+06|~              
+07|~              
+08|~              
+09|<e] [+] 4,1 All
+10|               
+
+--|---------|-----
+01|000000000000000
+02|000000000000000
+03|000000000000000
+04|000000000000000
+05|111111111111111
+06|111111111111111
+07|111111111111111
+08|111111111111111
+09|222222222222222
+10|333333333333333

tests/test_hipatterns.lua

@@ -355,7 +355,7 @@ T['enable()']['reacts to window scroll'] = function()
 end
 
 T['enable()']['reacts to delete of line with match'] = function()
-  set_lines({ 'xxx', 'xxx', 'abcd', 'xxx', 'xxx' })
+  set_lines({ 'abcd', 'xxx', 'xxx', 'abcd', 'xxx', 'xxx', 'abcd' })
 
   local hi_abcd = {
     pattern = 'abcd',
@@ -365,13 +365,19 @@ T['enable()']['reacts to delete of line with match'] = function()
   local config = { highlighters = { abcd = hi_abcd }, delay = { text_change = 30, scroll = 10 } }
   enable(0, config)
 
-  sleep(30 + 2)
+  sleep(30 + small_time)
   child.expect_screenshot()
 
-  child.api.nvim_win_set_cursor(0, { 3, 0 })
-  type_keys('dd')
-  sleep(30 + 2)
-  child.expect_screenshot()
+  local validate = function(line_to_delete)
+    child.api.nvim_win_set_cursor(0, { line_to_delete, 0 })
+    type_keys('dd')
+    sleep(30 + small_time)
+    child.expect_screenshot()
+  end
+
+  validate(1)
+  validate(3)
+  validate(5)
 end
 
 T['Highlighters'] = new_set()