This fixes an issue in the Cmus widget where the text color would not
change to reflect the current playback status unless the song was
changed (qtile#4904).

The reason for the issue is that the TextBox widget only redraws the
widget if the text changes without checking if layout information like
text color have changed.

We work around this issue by forcing a redraw if the playback status
changed while the text stayed the same.

This fixes an issue in the Cmus widget where the text color would not
change to reflect the current playback status unless the song was
changed (qtile#4904).

The reason for the issue is that the TextBox widget only redraws the widget if the text changes without checking if layout information like text color have changed.

We use the `_force_redraw` flag of the `TextWidget` to force a redraw
if the playback status changes to fix this.

Closes qtile#4904.

This fixes an issue in the Cmus widget where the text color would not
change to reflect the current playback status unless the song was
changed (qtile#4904).

The reason for the issue is that the TextBox widget only redraws the
widget if the text changes without checking if layout information like
text color have changed.

We use the `_force_redraw` flag of the `TextWidget` to force a redraw
if the playback status changes to fix this.

Closes qtile#4904.

This improves and extends the Cmus widget by

- replacing "play_icon" with "playing_text", "paused_text", and
  "stopped_text" which can be included depending on the current playback
  status using the "status_text" format variable,
- making "position", "duration", and "remaining" track information
  available in "[h:]mm:ss" format in the format string,
- adding information about all available format variables to the
  docstring,
- adding two additional format strings for streams and when no artist is
  available,
- replacing "play_color" and "noplay_color" with "playing_color",
  "paused_color", "stopped_color", and
- streamlining tests by replacing FakeBar approach with cmus_manager.

It provides a workaround for qtile#4904 because the text can now change
depending on the playback status.

It intends to keep full backwards compatibility with the exception of
showing the artist for non-local songs if available.

This improves and extends the Cmus widget by

- replacing "play_icon" with "playing_text", "paused_text", and
  "stopped_text" which can be included depending on the current playback
  status using the "status_text" format variable,
- making "position", "duration", and "remaining" track information
  available in "[h:]mm:ss" format in the format string,
- adding information about all available format variables to the
  docstring,
- adding two additional format strings for streams and when no artist is
  available,
- replacing "play_color" and "noplay_color" with "playing_color",
  "paused_color", "stopped_color", and
- streamlining tests by replacing FakeBar approach with cmus_manager.

It provides a workaround for qtile#4904 because the text can now change
depending on the playback status.

It intends to keep full backwards compatibility with the exception of
showing the artist for non-local songs if available.

This improves and extends the Cmus widget by

- replacing "play_icon" with "playing_text", "paused_text", and
  "stopped_text" which can be included depending on the current playback
  status using the "status_text" format variable,
- making "position", "duration", and "remaining" track information
  available in "[h:]mm:ss" format in the format string,
- adding information about all available format variables to the
  docstring,
- adding two additional format strings for streams and when no artist is
  available,
- replacing "play_color" and "noplay_color" with "playing_color",
  "paused_color", "stopped_color", and
- streamlining tests by replacing FakeBar approach with cmus_manager.

It provides a workaround for qtile#4904 because the text can now change
depending on the playback status.

It intends to keep full backwards compatibility with the exception of
showing the artist for non-local songs if available.

This improves and extends the Cmus widget by

- replacing "play_icon" with "playing_text", "paused_text", and
  "stopped_text" which can be included depending on the current playback
  status using the "status_text" format variable,
- making "position", "duration", and "remaining" track information
  available in "[h:]mm:ss" format in the format string,
- adding information about all available format variables to the
  docstring,
- adding two additional format strings for streams and when no artist is
  available,
- replacing "play_color" and "noplay_color" with "playing_color",
  "paused_color", "stopped_color", and
- streamlining tests by replacing FakeBar approach with cmus_manager.

It provides a workaround for qtile#4904 because the text can now change
depending on the playback status.

It intends to keep full backwards compatibility with the exception of
showing the artist for non-local songs if available.

This improves and extends the Cmus widget by

- replacing "play_icon" with "playing_text", "paused_text", and
  "stopped_text" which can be included depending on the current playback
  status using the "status_text" format variable,
- making "position", "duration", and "remaining" track information
  available in "[h:]mm:ss" format in the format string,
- adding information about all available format variables to the
  docstring,
- adding two additional format strings for streams and when no artist is
  available,
- replacing "play_color" and "noplay_color" with "playing_color",
  "paused_color", "stopped_color", and
- streamlining tests by replacing FakeBar approach with cmus_manager.

It provides a workaround for qtile#4904 because the text can now change
depending on the playback status.

It intends to keep full backwards compatibility with the exception of
showing the artist for non-local songs if available.

This improves and extends the Cmus widget by

- replacing "play_icon" with "playing_text", "paused_text", and
  "stopped_text" which can be included depending on the current playback
  status using the "status_text" format variable,
- making "position", "duration", and "remaining" track information
  available in "[h:]mm:ss" format in the format string,
- adding information about all available format variables to the
  docstring,
- adding two additional format strings for streams and when no artist is
  available,
- replacing "play_color" and "noplay_color" with "playing_color",
  "paused_color", "stopped_color", and
- streamlining tests by replacing FakeBar approach with cmus_manager.

It provides a workaround for #4904 because the text can now change
depending on the playback status.

It intends to keep full backwards compatibility with the exception of
showing the artist for non-local songs if available.