Fixed potential crash when manually emitting events.UPDATE_UI without an argument.

Raising an error results in an infinite loop, so just silently exit the handler.

Author: orbitalquark

core/ui.lua

@@ -302,7 +302,7 @@ events.connect(events.APPLEEVENT_ODOC,
 
 -- Sets buffer statusbar text.
 events.connect(events.UPDATE_UI, function(updated)
-	if updated & 3 == 0 then return end -- ignore scrolling
+	if not updated or updated & 3 == 0 then return end -- ignore scrolling
 	local text = not CURSES and '%s %d/%d    %s %d    %s    %s    %s    %s' or
 		'%s %d/%d  %s %d  %s  %s  %s  %s'
 	local pos = buffer.current_pos

modules/textadept/editing.lua

@@ -551,7 +551,7 @@ end, 1)
 
 -- Highlights matching braces.
 events.connect(events.UPDATE_UI, function(updated)
-	if updated & 3 == 0 then return end -- ignore scrolling
+	if not updated or updated & 3 == 0 then return end -- ignore scrolling
 	if brace_matches[buffer.char_at[buffer.current_pos]] then
 		local match = buffer:brace_match(buffer.current_pos, 0)
 		local f = match ~= -1 and view.brace_highlight or view.brace_bad_light
@@ -563,7 +563,7 @@ end)
 
 -- Highlight all instances of the current or selected word.
 events.connect(events.UPDATE_UI, function(updated)
-	if updated & buffer.UPDATE_SELECTION == 0 or ui.find.active then return end
+	if not updated or updated & buffer.UPDATE_SELECTION == 0 or ui.find.active then return end
 	if M.highlight_words == M.HIGHLIGHT_NONE then return end
 	buffer.indicator_current = M.INDIC_HIGHLIGHT
 	buffer:indicator_clear_range(1, buffer.length)

modules/textadept/menu.lua

@@ -24,7 +24,8 @@ local function deselect()
 	buffer:set_empty_selection(buffer._deselect_pos)
 end
 events.connect(events.UPDATE_UI, function(updated)
-	if updated & 3 > 0 and buffer.selection_empty then buffer._deselect_pos = buffer.current_pos end
+	if not updated or updated & 3 == 0 or not buffer.selection_empty then return end
+	buffer._deselect_pos = buffer.current_pos
 end)
 --- Wrapper around `buffer:upper_case()` and `buffer:lower_case()`.
 local function change_case(upper)

modules/textadept/snippets.lua

@@ -747,7 +747,7 @@ setmetatable(M,
 -- Update snippet transforms when text is added or deleted.
 events.connect(events.UPDATE_UI, function(updated)
 	if not active_snippet then return end
-	if updated & buffer.UPDATE_CONTENT > 0 then active_snippet:update_transforms() end
+	if updated and updated & buffer.UPDATE_CONTENT > 0 then active_snippet:update_transforms() end
 	if #keys.keychain == 0 then ui.statusbar_text = _L['Snippet active'] end
 end)