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Fix header of translation file

Updated pt_BR translation

Add a spawn module for Geany

Thanks a lot for Dimitar's hard work, commitment and endless patience!

Closes #274, #441, and https://sourceforge.net/p/geany/bugs/943/
Should also fix https://sourceforge.net/p/geany/bugs/898/

Fix typos in messages

It was already fixed in source.

Fix wrong German translations

The translation for "document" already had one.

The translation did not distinguish between "source file" and "file"
although it makes sense (e.g. for diff files which are not source).

Fix language check in tm_workspace_find()

Fix empty symbol tree under some conditions

When the Symbols tab isn't shown, symbol tree isn't updated. However,
we should record the cases when update should have been performed
and once the symbols tab is shown, perform update if something changed.

Thanks to this patch we also don't have to always perform symbol tree
update when switching to the Symbols tab but only when something has
actually changed.

The tags_lang variable is set from the first tag in the found array but
the array may actually contain tags from several languages. This may
lead to two things:

1. Goto tag definition goes to a tag from a different filetype
2. Worse, the first tag is from a different language than the current file
and we get a message that no tag was found

Get lang for every tag in the array and rename tags_lang to tag_lang.

Closes #483.

Reload tooltip in the symbol tree also on tag update

Communicate terminal dirty-ness to users in a better way

The tree model nodes consist of GNode structs:

struct GNode {
  gpointer data;
  GNode	  *next;
  GNode	  *prev;
  GNode	  *parent;
  GNode	  *children;
};

where children are a linked list. To append a value, the list has to be
walked to the end and with nodes with many children (which is our case)
this becomes very expensive.

We sort the tree afterwards anyway so it doesn't matter where we insert the
value.

About 30% faster tree creation.

gtk_tree_store_set() becomes very slow when the tree gets bigger
because internally it calls gtk_tree_store_get_path() which counts
all the entries in a linked list of elements at the same tree level
to get the tree path.

Avoid the call of this function when not needed.

Because function return types are not used to determine tag equality,
we need to also update the tooltip of an existing tag otherwise the return
type doesn't get updated when changed.

Fix typos in German translation

This is not completely obvious - when I first saw the message, I started
pressing backspace which really doesn't help.

Also clarify and shorten the message a bit - in "Could not execute the file
in the VTE because it probably contains a command" it's not clear if it's
the file or VTE which contains the command. Also use "terminal" instead
of "VTE" which is more user-friendly.

Right now users are confused when various VTE actions don't work because
there's no indication that the terminal is in the non-clean state.

Visualise "modified" terminal in the same way as modified document - by
a red label in the tab so it's clearer when terminal isn't clean.

Avoid quick red flashes when pressing enter by delaying the color change
a bit.

Remove deprecated and unnecessary use of GeanyFunctions declaration