Many layouts are written as layout modifiers because they need to
change the stack of the rectangle before executing doLayout.
This is a major source of bugs. all layout modifiers should be using the
LayoutModifier class. This method (modifyLayout) can be used to
manipulate the rectangle and the stack before running doLayout by the
layout modifier.
WARNING: this patch may be breaking your configuration. While it is
still possible to use:
tabbed shrinkText defaultTConf
updating the fields of the defaultTConf record is not possible
anymore, since the type TConf is now hidden.
WARNING: "tabSize" has been substituted by "decoHeight"
You can change your configuration this way:
myTConf :: TConf
myTConf = defaultTConf
{ tabSize = 15
, etc....
becomes:
myTConf :: DeConfig TabbedDecoration Window
myTConf = defaultTabbedConfig
{ decoHeight = 15
, etc....
and
tabbed shrinkText myTConf
becomes:
tabDeco shrinkText myTConf
The initial patch that extended the EDSL for writing ManageHook rules did not come with a good example on how to use it. This patch ammends that. 'move' is an example of how to write a rule to resolve a Query (Maybe a) into something tangible. 'move'' is an example of how to write a rule isolating window managing code from the rest ofthe mess the EDSL creates.
This patch adds a few types of relationships and operators for managing windows with rules. It provides grouping operators so the X action can access the quantifier that was matched or not matched. It provides a formalism for predicates that work in both grouping and non grouping rules. It could do with some classes, so that there are fewer operators that always do the Right Thing (TM), but the Haskell Type system currently has some problems resolving types. Since I don't know enough about these high level things, it would be hard to create a GHC patch just to make it all work.
