TextSearch: only grep files

fix #17012

Change-Id: Id721ec57945d9a57824ae53bf591d0e09a2b53f3
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4094
Reviewed-by: Rene Gollent <rene@gollent.com>

Allow TextSearch to grep XHTML files

...while the setting "Text files only" is active.
Fixes #12539.

Once users are able to set supported MIME types on packaged apps
(which are read-only), it might be a good idea to have TextSearch
check its supported MIME types and examine the target files accordingly.

* If you only want to search in text files, TextSearch will now guess the MIME
type if a file doesn't have one yet (and set it), instead of ignoring it
completely.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33694 a95241bf-73f2-0310-859d-f6bbb57e9c96

Refactoring
* FileIterator is now a mostly abstract interface
* FolderIterator is the currently only implementation (there could be
MessageIterator for an even better separation, which would read the top
level search folders from the BMessage with the selected poses, but it
would mostly use the same code for traversing the subfolders anyways so I
left that for the time being.)
* The Grepper and FolderIterator now copy the current settings from the Model
at instantiation. Since they run in a separate thread and the Model may
actually be changed from the Window thread, I think this is just a cleaner
and more safe solution.
* Cleanup here and there.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26786 a95241bf-73f2-0310-859d-f6bbb57e9c96

Refactored a new class FileIterator from Grepper that will make adding
node monitoring easier. Also, FileIterator will be split to make the code
cleaner with regards to folder or selection mode.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26752 a95241bf-73f2-0310-859d-f6bbb57e9c96

* If you only want to search in text files, TextSearch will now guess the MIME
type if a file doesn't have one yet (and set it), instead of ignoring it
completely.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33694 a95241bf-73f2-0310-859d-f6bbb57e9c96

Refactoring
* FileIterator is now a mostly abstract interface
* FolderIterator is the currently only implementation (there could be
MessageIterator for an even better separation, which would read the top
level search folders from the BMessage with the selected poses, but it
would mostly use the same code for traversing the subfolders anyways so I
left that for the time being.)
* The Grepper and FolderIterator now copy the current settings from the Model
at instantiation. Since they run in a separate thread and the Model may
actually be changed from the Window thread, I think this is just a cleaner
and more safe solution.
* Cleanup here and there.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26786 a95241bf-73f2-0310-859d-f6bbb57e9c96

Refactored a new class FileIterator from Grepper that will make adding
node monitoring easier. Also, FileIterator will be split to make the code
cleaner with regards to folder or selection mode.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26752 a95241bf-73f2-0310-859d-f6bbb57e9c96