Interactive Autocompletion doesn't work

Hello!

• Distribution: Arch
• Release: Git 54400ccf
• Installed dependencies:

$ pacman -Q `pactree jucipp-git -ld1`

jucipp-git r2971.54400ccf-1
gtksourceviewmm 1:3.18.0-7
clang 18.1.8-4
aspell-en 2020.12.07-2
lldb 18.1.8-1
boost-libs 1.86.0-3
libgit2 1:1.8.1-1
ctags 1:6.1.0-2

config.json

{
  "version": "1.8.0.2",
  "gtk_theme": {
    "name_comment": "Use \"\" for default theme, At least these two exist on all systems: Adwaita, Raleigh",
    "name": "",
    "variant_comment": "Use \"\" for default variant, and \"dark\" for dark theme variant. Note that not all themes support dark variant, but for instance Adwaita does",
    "variant": "",
    "font_comment": "Set to override theme font, for instance: \"Arial 12\"",
    "font": ""
  },
  "source": {
    "style_comment": "Use \"\" for default style, and for instance juci-dark or juci-dark-blue together with dark gtk_theme variant. Styles from normal gtksourceview install: classic, cobalt, kate, oblivion, solarized-dark, solarized-light, tango",
    "style": "juci-light",
    "font_comment": "Use \"\" for default font, and for instance \"Monospace 12\" to also set size",
    "font": "Monospace",
    "add_missing_newline_at_end_of_file_on_save": true,
    "remove_trailing_whitespace_characters_on_save": false,
    "show_whitespace_characters_comment": "Determines what kind of whitespaces should be drawn. Use comma-separated list of: space, tab, newline, nbsp, leading, text, trailing or all",
    "show_whitespace_characters": "",
    "format_style_on_save_comment": "Performs style format on save if supported on language in buffer",
    "format_style_on_save": false,
    "format_style_on_save_if_style_file_found_comment": "Format style if format file is found, even if format_style_on_save is false",
    "format_style_on_save_if_style_file_found": true,
    "smart_brackets_comment": "If smart_inserts is enabled, this option is automatically enabled. When inserting an already closed bracket, the cursor might instead be moved, avoiding the need of arrow keys after autocomplete",
    "smart_brackets": true,
    "smart_inserts_comment": "When for instance inserting (, () gets inserted. Applies to: (), [], \", '. Also enables pressing ; inside an expression before a final ) to insert ; at the end of line, and deletions of empty insertions",
    "smart_inserts": true,
    "show_map": true,
    "map_font_size": 1,
    "show_git_diff": true,
    "show_background_pattern": true,
    "show_right_margin": false,
    "right_margin_position": 80,
    "pixels_between_lines": 0,
    "spellcheck_language_comment": "Use \"\" to set language from your locale settings",
    "spellcheck_language": "en_US",
    "auto_tab_char_and_size_comment": "Use false to always use default tab char and size",
    "auto_tab_char_and_size": true,
    "default_tab_char_comment": "Use \"\t\" for regular tab",
    "default_tab_char": " ",
    "default_tab_size": 2,
    "tab_indents_line": true,
    "word_wrap_comment": "Specify language ids that should enable word wrap, for instance: chdr, c, cpphdr, cpp, js, python, or all to enable word wrap for all languages",
    "word_wrap": "markdown, latex",
    "highlight_current_line": true,
    "show_line_numbers": true,
    "enable_multiple_cursors": false,
    "auto_reload_changed_files": true,
    "search_for_selection": true,
    "tooltip_top_offset": 0,
    "clang_format_style_comment": "IndentWidth, AccessModifierOffset and UseTab are set automatically. See http://clang.llvm.org/docs/ClangFormatStyleOptions.html",
    "clang_format_style": "ColumnLimit: 0, NamespaceIndentation: All",
    "clang_tidy_enable_comment": "Enable clang-tidy in new C/C++ buffers",
    "clang_tidy_enable": false,
    "clang_tidy_checks_comment": "In new C/C++ buffers, these checks are appended to the value of 'Checks' in the .clang-tidy file, if any",
    "clang_tidy_checks": "",
    "clang_usages_threads_comment": "The number of threads used in finding usages in unparsed files. -1 corresponds to the number of cores available, and 0 disables the search",
    "clang_usages_threads": -1,
    "clang_detailed_preprocessing_record_comment": "Set to true to, at the cost of increased resource use, include all macro definitions and instantiations when parsing new C/C++ buffers. You should reopen buffers and delete build/.usages_clang after changing this option.",
    "clang_detailed_preprocessing_record": false,
    "debug_place_cursor_at_stop": false
  },
  "terminal": {
    "history_size": 10000,
    "font_comment": "Use \"\" to use source.font with slightly smaller size",
    "font": "",
    "clear_on_compile": true,
    "clear_on_run_command": false,
    "hide_entry_on_run_command": true
  },
  "project": {
    "default_build_path_comment": "Use <project_directory_name> to insert the project top level directory name",
    "default_build_path": "./build",
    "debug_build_path_comment": "Use <project_directory_name> to insert the project top level directory name, and <default_build_path> to insert your default_build_path setting.",
    "debug_build_path": "<default_build_path>/debug",
    "cmake": {
      "command": "cmake",
      "compile_command": "cmake --build . --parallel 16"
    },
    "meson": {
      "command": "meson",
      "compile_command": "ninja"
    },
    "default_build_management_system_comment": "Select which build management system to use when creating a new C or C++ project, for instance \"cmake\" or \"meson\"",
    "default_build_management_system": "meson",
    "save_on_compile_or_run": true,
    "ctags_command": "ctags",
    "grep_command": "grep",
    "cargo_command": "cargo",
    "python_command": "python -u",
    "markdown_command": "grip -b",
    "open_with_default_application_comment": "Comma-separated list of file extensions that should be opened with system default applications",
    "open_with_default_application": ".pdf,.png"
  },
  "keybindings": {
    "preferences": "<primary>comma",
    "snippets": "",
    "commands": "",
    "quit": "<primary>q",
    "file_new_file": "<primary>n",
    "file_new_folder": "<primary><shift>n",
    "file_open_file": "<primary>o",
    "file_open_folder": "<primary><shift>o",
    "file_find_file": "<primary>p",
    "file_switch_file_type": "<alt>o",
    "file_reload_file": "",
    "file_save": "<primary>s",
    "file_save_as": "<primary><shift>s",
    "file_close_file": "<primary>w",
    "file_close_folder": "",
    "file_close_project": "",
    "file_close_other_files": "",
    "file_print": "",
    "edit_undo": "<primary>z",
    "edit_redo": "<primary><shift>z",
    "edit_cut": "<primary>x",
    "edit_cut_lines": "<primary><shift>x",
    "edit_copy": "<primary>c",
    "edit_copy_lines": "<primary><shift>c",
    "edit_paste": "<primary>v",
    "edit_extend_selection": "<primary><shift>a",
    "edit_shrink_selection": "<primary><shift><alt>a",
    "edit_show_or_hide": "",
    "edit_find": "<primary>f",
    "source_spellcheck": "",
    "source_spellcheck_clear": "",
    "source_spellcheck_next_error": "<primary><shift>e",
    "source_git_next_diff": "<primary>k",
    "source_git_show_diff": "<alt>k",
    "source_indentation_set_buffer_tab": "",
    "source_indentation_auto_indent_buffer": "<primary><shift>i",
    "source_goto_line": "<primary>g",
    "source_center_cursor": "<primary>l",
    "source_cursor_history_back": "<alt>Left",
    "source_cursor_history_forward": "<alt>Right",
    "source_show_completion_comment": "Add completion keybinding to disable interactive autocompletion",
    "source_show_completion": "",
    "source_find_symbol": "<primary><shift>f",
    "source_find_pattern": "<alt><shift>f",
    "source_comments_toggle": "<primary>slash",
    "source_comments_add_documentation": "<primary><alt>slash",
    "source_find_documentation": "<primary><shift>d",
    "source_goto_declaration": "<primary>d",
    "source_goto_type_declaration": "<alt><shift>d",
    "source_goto_implementation": "<primary>i",
    "source_goto_usage": "<primary>u",
    "source_goto_method": "<primary>m",
    "source_rename": "<primary>r",
    "source_implement_method": "<primary><shift>m",
    "source_goto_next_diagnostic": "<primary>e",
    "source_apply_fix_its": "<control>space",
    "project_set_run_arguments": "",
    "project_compile_and_run": "<primary>Return",
    "project_compile": "<primary><shift>Return",
    "project_run_command": "<alt>Return",
    "project_kill_last_running": "<primary>Escape",
    "project_force_kill_last_running": "<primary><shift>Escape",
    "debug_set_run_arguments": "",
    "debug_start_continue": "<primary>y",
    "debug_stop": "<primary><shift>y",
    "debug_kill": "<primary><shift>k",
    "debug_step_over": "<primary>j",
    "debug_step_into": "<primary>t",
    "debug_step_out": "<primary><shift>t",
    "debug_backtrace": "<primary><shift>j",
    "debug_show_variables": "<primary><shift>b",
    "debug_run_command": "<alt><shift>Return",
    "debug_toggle_breakpoint": "<primary>b",
    "debug_show_breakpoints": "<primary><shift><alt>b",
    "debug_goto_stop": "<primary><shift>l",
    "window_next_tab": "<primary>Tab",
    "window_previous_tab": "<primary><shift>Tab",
    "window_goto_tab": "",
    "window_toggle_split": "",
    "window_split_source_buffer": "",
    "window_toggle_full_screen": "F11",
    "window_toggle_directories": "",
    "window_toggle_terminal": "",
    "window_toggle_status": "",
    "window_toggle_menu": "",
    "window_toggle_tabs": "",
    "window_toggle_zen_mode": "",
    "window_clear_terminal": ""
  },
  "documentation_searches": {
    "clang": {
      "separator": "::",
      "queries": {
        "@empty": "https://www.google.com/search?q=c%2B%2B+",
        "std": "https://www.google.com/search?q=site:http://www.cplusplus.com/reference/+",
        "boost": "https://www.google.com/search?q=site:http://www.boost.org/doc/libs/1_59_0/+",
        "Gtk": "https://www.google.com/search?q=site:https://developer.gnome.org/gtkmm/stable/+",
        "@any": "https://www.google.com/search?q="
      }
    }
  },
  "log": {
    "libclang_comment": "Outputs diagnostics for new C/C++ buffers",
    "libclang": false,
    "language_server": false
  }
}

All values on default except "default_build_management_system": "meson" but it also happens with cmake.

The interactive autocompletion doesn't work:

Workaround: Set a keybinding for manual completion e.g. "source_show_completion": "<control>space".

Thanks for your work 🙂

PS: Autocompletion with VIM/NVIM and LSP works as fine.