feat: add option to disable name truncation

[akinsho]

This fixes #532 by allowing a user to set autosize = true in config.options. With this enabled, users can allow filename to extend up to their full name length.

Can you test this out @ray-x, I might change the option name in future commits since I'm not sure I like autosize it's really not very descriptive.

TODO

• Docs
• Tests

[ray-x]

Thanks for the quick PR. It is great and autosize works for me.
However, I saw a issue. It may not related to this PR. I have 3 file in buffer. However if the windows size is small. There is a corner cases I failed to move to next tab. Please refer to the video.

test1-2022-09-02_21.07.48.mp4

[akinsho]

@ray-x I don't think I still understand what is going wrong there. What is the behaviour you are expecting? Just to clarify, the truncation markers are not buttons, so you cannot click on them.

[akinsho]

Anyway, if you can clarify the bug feel free to raise an issue. In the meantime I will merge this PR into the dev branch for release into the main branch later on.

[ray-x]

There are 2 cases that not smooth.

• case 1
  suppose I have three files, long_file_name_file_1, long_file_name_file_2, long_file_name_file_3. What I saw is
  | empty_space |long_file_name_file_2| empty_space |

There is no way I can use mouse to move to the next buffer. I have to use bnext/bprev (also BufferLinePick not working as only one tab is shown)

• case 2
  3 files, as above, but 2 of them are shown in bufferline tab
  | long_file_name_file_1 | long_file_name_file_2|
  What I expected is if I change focus to long_file_name_file_2, the tab should look like this:
  | long_file_name_file_2 | long_file_name_file_3|
  If I click on long_file_name_file_2, it should look like this:
  | long_file_name_file_1 | long_file_name_file_2|

Is it possible to show at least 2 tabs and the behavior this way (suppose I have 5 files and 3 of them are shown)
| long_file... | long_file_name_file_3 | long_file... |
If I click on long_file... on the right, it will be
| long_file... | long_file_name_file_4 | long_file... |
If I click on long_file... on the left, it will be
| long_file... | long_file_name_file_2 | long_file... |