lualine.nvim/BREAKING_CHANGES.md

This file contains breaking changes in chronological order. It's possible
breaking change has been made several times to the same thing. In that case
the one nearest the bottom indicates current state.

### Color option unification
color_added, color_modified, color_removed options in diff & color_error,
color_warning, color_info, color_hint too only fg color that was different
from other color options that took fg ,bg & gui changes were made to make
them similar.

So instead of
```lua
color_added = '#rrbbgg',
```
You'll have
```lua
color_added = { fg = '#rrbbgg' }
```
for the same effect.

### Theme rename
Some themes were renamed so they are same as their `g:color_name`
- oceanicnext      -> OceanicNext
- papercolor       -> PaperColor
- tomorrow         -> Tomorrow
- gruvbox_material -> gruvbox-material
- modus_vivendi    -> modus-vivendi

### function components now receive some default parameters
Now function components receive the same args as `update_status`. So the function
signature is now:
```lua
function(self, is_active)
```
`self` is a table that represents the component in lualine & `is_active` is
a boolean value that indicates whether the function is being evaluated
for an active statusline or an inactive statusline. This means function components
can be more versatile. But it also means you can't use functions that take
optional arguments directly as function component. `lsp_status` is such
a case that takes an optional `winid` in its first argument.
You can wrap it with a function so the `self` & `is_active` don't
get passed to `lsp_status`
```lua
lualine_c = { function() return require'lsp-status'.status() end}
```

### Options simplification
See [#24](https://github.com/nvim-lualine/lualine.nvim/pull/24) for details
- `upper` & `lower` removed use `string.upper/lower` in `fmt` option.
- separators are specified by left & right instead of position
  instead of `{'>', '<'}` you'll use `{left= '>', right='<'}`.
- `left_padding` & `right_padding` removed. You can specify left or right
  padding with a padding option like padding = `{ left = 5 }`
- Option rename:
 - condition -> cond
 - format -> fmt
 - disable_text -> icon_only
- color_added, color_modified, color_removed are now available as added,
modified, removed in diff_color table option
- color_error, color_warning, color_info, color_hint are now available
as error, warn, info, hint in diagnostics_color table option

### Component class refactor
***Applicable only ones responsible for custom components***
- Now call extend method on super class to create new type of component instead of calling new with empty args.
- Don't overrite new method for initialization. Overrite init instead.
- rename Component._parent -> Component.super
- Call methods from super class directly on classes super not through
  objects super or self.super
So basically if you had something like
```lua
local my_comp = require'lualine.component':new()
function mycomp:new(options, child)
  local obj = self._parent:new(options, child or my_comp)
  obj.x = 1
  obj.y = 2
  return obj
end
```
change it to
```lua
local my_comp = require('lualine.component'):extend()

function my_comp:init(options)
  -- Notice carefully it's not self.super.init nor my_comp.super:init
  my_comp.super.init(self, options)
  self.x = 1
  self.y = 2
end
```